题目内容 (请给出正确答案)
[主观题]

Although lube oils used in the main lubricating service systems should have a relatively h

igh flash point to avoid ignition, they can create smoke and fire hazards when they _____.

A.are exposed to a vacuum

B.come in contact with extremely hot surfaces

C.are reduced in temperature to just above the pour point

D.become extremely agitated or aerated

提问人:网友deamongel 发布时间:2022-01-06
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更多“Although lube oils used in the…”相关的问题
第1题
A lube oil sample taken from the main engine lube oil system has dark yellow opaque colorT
his is the result of .

A.water contamination

B.mixing oils of two widely different viscosities

C.overheating

D.aeration

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第2题
Heavy residual fuel oils are heated prior to centrifuging to ______.A.reduce fuel weightB.

Heavy residual fuel oils are heated prior to centrifuging to ______.

A.reduce fuel weight

B.increase specific gravity

C.separate fuel from lube oil

D.reduce fuel viscosity

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第3题
Sludge formation in a diesel engine lube oil system is caused by________.A.carbonization o

Sludge formation in a diesel engine lube oil system is caused by________.

A.carbonization of oils from the combustion chambers

B.emulsions of lube oil and water

C.coagulation of unburned fuel below the piston rings

D.all of the above

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第4题
When comparing different fuels for different engines, the ignition quality of diesel fuel
oils becomes a less critical consideration as ______________.

A.the amount of lube oil additives increase

B.piston speeds increase

C.injection pressure decrease

D.engine speeds decrease

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第5题
Don’t be afraid of asking for help ________ it is needed.A. althoughB. sinceC. whenD. u

A. although

B. since

C. when

D. unless

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第6题
听力原文: How many of you drink cola? Nearly everybody. Do you know that cola started out
not as a soft drink but as a cure for headaches back in the late 1800's? John St. Pamberton, a druggist from Atlanta, had experimented for many months trying to find a cure for the common headache. He worked in his backyard, mixing and heating different combinations of oils and flavors until he found one that seemed promising. Pamberton bottled the mixture and began selling it in drugstores as a concentrated syrup that the customer had to mix with water before drinking.

Cola's transformation from a medical syrup to a carbonated soft drink came about quite by accident. One day, a customer came into a drugstore complaining of a headache and asked for a bottle of cola syrup. He wanted to take it right away. So he asked the clerk to mix the medicine while he waited. The clerk, instead of walking to the other end of the counter to get plain water, suggested mixing the syrup with soda water. The customer agreed, and after drinking it, remarked how good it tasted. The clerk continued offering the mixture and carbonated cola grew in popularity. Today carbonated colas are sold in most countries around the world. And although they no longer contain the ingredients used to cure headaches, they are still very refreshing.

What does the monologue mainly discuss?

A.A recipe for a soft drink.

B.The medical effects of cola.

C.The history of cola.

D.Soft drink production.

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第7题
SECTION BPASSAGESDirections: In this section, you will hear several passages. Listen to th

SECTION B PASSAGES

Directions: In this section, you will hear several passages. Listen to the passages carefully and then answer the questions that follow.

听力原文: Did you know that cola started out not as a soft drink but as a cure for headache back in the late 1800's? John S. Pamberton, a druggist from Atlanta, had experimented for many months trying to find a cure for the common headache. He worked in his backyard, mixing and heating different combinations of oils and flavors until he found one that seems promising. Pamberton bottled the mixture and began selling it in drugstores as a concentrated syrup that the customer had to mix with water before drinking. Cola's transformation from a concentrated syrup to a carbonated soft drink came about quite by accident. One day, a customer came into a drugstore complaining of a headache and asked for a bottle of cola syrup. He wanted to take 'it right away. So he asked the clerk to mix the medicine while he waited. The clerk, instead of walking to the other end of the counter to get plain water, suggested mixing the syrup with soda water. The customer agreed, and after drinking it, remarked how good it tasted. The clerk continued offering the mixture and carbonated cola grew in popularity. Today carbonated cola is sold in most countries around the world. And although they no longer contain the ingredients to kill headaches, they are still very refreshing.

The talk is mainly about ______.

A.the function of cola

B.the invention of cola

C.the ingredients of cola

D.the popularity of cola

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第8题
听力原文:How many of you drink cola? Nearly everybody. Did you know that cola started out

听力原文: How many of you drink cola? Nearly everybody. Did you know that cola started out not as a soft drink but as a cure for headache back in the late 1800's? John S. Pamberton, a drugist from Atlanta, had experimented for many months trying to find a cure for the common headache. He worked in his back yard, mixing and heating different combinations of oils and flavors until he found one that seems promising.

Pamberton bottled the mixture and began selling it in drugstores as a concentrated syrup that the customer had to mix with water before drinking. Cola's transformation from a concentrated syrup to a carbonated soft drink came about quite by accident. One day, a customer came into a drugstore complaining of a headache and asked for a bottle of cola syrup. He wanted to take it right away. So he asked the clerk to mix the medicine while he waited. The clerk, instead of walking to the other end of the counter to get plain water, suggested mixing the syrup with soda water. The customer agreed, and after drinking it, re marked how good it tasted. The clerk continued offering the mixture and carbonated cola grew in popularity. Today carbonated colas are sold in most countries around the world. And although they no longer contain the ingredients to kill headache, they are still 'very refreshing.

(33)

A.A recipe for a soft drink.

B.The medicinal effects of cola.

C.The history of cola.

D.Softdrink production.

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第9题
听力原文:How many of you drink cola? Nearly everyone. Did you know that cola started out n

听力原文: How many of you drink cola? Nearly everyone. Did you know that cola started out not as a soft drink but as a cure for headaches back in the late 1800's? john S Pemberton, a druggist from Atlanta, had experimented for many months trying to find a cure for the common headache. He worked in his backyard, mixing and heating different combinations of oils and flavors until he found one that seemed promising. Pemberton bottled the mixture and began selling it in drug stores as concentrated syrup that the customer had to mix with water before drinking. Cola's transformation from medicinal syrup to a carbonated soft drink came about quite by accident. One day, a customer came into a drugstore complaining of a headache and asked for a bottle of cola syrup. He wanted to take it right away. So he asked the clerk to mix the medicine while he waited. The clerk, instead of walking to the other end of the counter to get plain water, suggested mixing the syrup with soda water. The customer agreed, and after drinking it, remarked how good it tasted. The clerk continued offering the mix and carbonated cola grew in popularity. Today carbonated colas are sold in most countries around the world. And although they no longer contain the ingredients used to cure headache, they are still very refreshing.

(29)

A.Softdrink production.

B.A recipe for a soft drink.

C.The medicinal effects of cola.

D.The history of cola.

点击查看答案
第10题
SECTION BPASSAGESDirections: In this section, you will hear several passages. Listen to th

SECTION B PASSAGES

Directions: In this section, you will hear several passages. Listen to the passages carefully and then answer the questions that follow.

听力原文: How many of you drink cola? Nearly everybody. Did you know the cola started out not as a soft drink, but as a cure for headache back late in eighteen hundreds?

John S. Pemberton, a druggist from Atlanta had experimented for many months trying to find a cure for the common headache. He worked in his backyard mixing and heating different combination of oils and flavors until he found one which seemed promising. Pemberton bottled the mixture and began selling it in drugstores as a concentrated syrup that the customers had to mix with water before drinking. Cold's transformation from a medical syrup to a carbonated syrup drink came about quite by accident. One day, a customer came into a drug store complaining of the headache, and asked for a bottle of cola syrup. He wanted to take it right away, so he asked the clerk to mix the medicine while he waited. The clerk, instead of walking to the other end of the counter to get plain water, suggested mixing the syrup with soda water. The customer agreed. And after drinking it he remarked bow good it tasted. The clerk continued offering the mix, and combinative colas grew into popularity.

Today, carbonated colas are sold in most countries around the world. And although they no longer contain the ingredients to kill headaches, they are still very refreshing.

How was cola originally sold?

A.As a soft drink.

B.As a medicine.

C.As flavored hard candy.

D.As a cooking oil.

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