题目内容
（请给出正确答案）
When a refrigeration compressor is in the ‘off’ cycle, the thermal expansion valve will .
A.always be wide open when the compressor restarts
B.continue to operate as if the system were in operation
C.remain open until evaporator pressure equalizes, then close until the compressor restarts
D.always be completely closed until the compressor restarts
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更多“When a refrigeration compresso…”相关的问题
A.flooding back
B.superheating
C.overflowing
D.recycling
A refrigeration unit will tend to short cycle when operating _____.
A.under heavy loads
B.during hot gas defrost
C.under light loads
D.during starting conditions
When adding oil to a refrigeration system, precautions must be taken to ensure that
A.the compressor suction pressure is not too high
B.all air is purged from the pump and charging fittings
C.the high pressure cutout switch is held open to prevent accidental starting
D.the condenser is completely shutdown first
A.loose expansion valve control bulb
B.low differential setting on the H.Pcutout
C.blown fuse in the motor circuit
D.faulty suction pressure regulator
A.has run continuously for a long period
B.suction pressure is below normal
C.oil level is below normal
D.starts after a long idle period
A.increase the amount of cooling water to the condenser
B.decrease the amount of cooling water to the condenser
C.add more refrigerant to the system
D.remove some refrigerant from the system
A．It is impossible to measure with accuracy the quantity of ozone-destroying chemicals that exist as coolants in refrigerators.
B．In modern societies, refrigeration of food is necessary to prevent unhealthy and potentially life-threatening conditions.
C．Replacement chemicals that will not destroy ozone have not yet been developed and would be more expensive than the chemicals now used as coolants in refrigerators.
D．Even if people should give up the use of refrigeration, the coolants already in existing refrigerators are a threat to atmospheric ozone.
E．The coolants in refrigerators can be fully recovered at the end of the useful life of the refrigerators and reused.
Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
听力原文： During the summer you should be even more careful than usual of the food you prepare. Food spoils faster in hot weather than in cold weather. When you are shopping, purchase frozen and refrigerated foods at last. Don't make long stops on the way home, because frozen foods could become soft or warm. Using insulated bags helps keep food cold until you can get home. Milk and milk products should be refrigerated immediately. When camping or picnicking, or at any time [27]when refrigeration isn't available, use special dry food. Don't leave foods in a hot car or beach bag. Picnic favorites like meat, chicken, and egg salad should be kept in a cooler. Above all, if a food doesn't seem to be normal in odor or appearance, [28]discard it immediately. Don't taste it.
(27)
A．The advantage of refrigeration.
B．Food preservation in the summer.
C．Cooking food in the summer.
D．Fun in the summer.
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