题目内容
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A.operated continuously while vapors may be present
B.operated intermittently to remove vapors
C.available on standby for immediate use
D.shut down if an explosive mixture is present
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For safety reasons，when assistance towing ______．
A.the disabled vessel should be towed to the nearest port
B.the disabled vessel should be inspected for flammable gases
C.passengers should always be removed from the disabled vessel
D.personnel on the disabled vessel should don PFD's
What did police attribute the accident to？
A．Poor visibility.
B．Slippery conditions caused by the rain.
C．Both A and B
D．The narrow national highway.
What did police attribute the accident to？
A．Poor visibility.
B．Slippery conditions caused by the rain.
C．Both A and B
D．The narrow national highway.
When disconnecting the power cord from the power outlet,always take hold of the plug,and not the wire,and pull flee.Never connect or disconnect the power plug with our hands wet since you may receive an electric shock.
For really dirty clothing use hot water 40℃.
For removal of blood stains use cold water only.
Stain Removal and Bleaching：
Add 1/2 cap per liter of water.
Soak laundry well in solution for at least 20-30 minutes and wash.
Rinse thoroughly.
Power source:220V/50Hz
Power consumption:400W
Washing capacity:3kg
Spin capacity:3kg
Net weight:30kg
Dimension:500×500×850mm
Small holes are useful in refrigeration because they ______ .
A．can change gases into liquids
B．can turn oxygen into a liquid
C．can allow molecules to go quicker
D．can make molecules further apart
Section B
Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice.
The very high temperatures attained in a nuclear explosion result in the formation of an extremely hot intense mass of gas called a fireball. For a l0-kiloton (千吨，核弹当量单位) explosion in the air, the fireball will attain a maximum diameter of about 300m; for a l0-megaton (兆吨，核弹当量单位) weapon the fireball may be 4.8 km across. A flash of heat radiation is emitted from the fireball and spreads out over a large area, but with steadily decreasing intensity. The amount of heat energy received a certain distance from the nuclear explosion depends on the power of the weapon and the state of the atmosphere. If the visibility is poor or the explosion takes place above clouds, the effectiveness of the heat flash is decreased. The heat radiation falling on exposed skin can cause what called flash burns. A 10-kiloton explosion in the air can produce moderate (second-degree) flash burns, which require some medical attention, as far as 2.4 km from ground zero; for a 10-megaton bomb, the corresponding distance would be more than 32 km. milder burns of bare skin would be experienced even farther out. Most ordinary clothing provides protection from the heat radiation, as does almost any opaque (不透明的) object. Flash burns occur only when the bare skin is directly exposed, or if the clothing is too thin to absorb the heat radiation.
The heat radiation can start fires in dry, flammable materials, for example, paper and some fabrics, and such fires may spread if conditions are suitable. The evidence from the A-bomb explosions over Japan indicates that many fires, especially in the area near ground zero, originated from secondary causes, such as electrical short circuits, broken gas lines, and upset furnaces and boilers in industrial plants. The blast damage produced wreckage that helped to maintain the fires and denied access to fire-fighting equipment. Thus, much of the fire damage in Japan was a secondary effect to the blast wave.
Under some conditions, such as existed at Hiroshima but not at Nagasaki, many individual fires can combine to produce a fire storm similar to those that accompany some large forest fires. The heat of the fire causes a strong updraft (向上排气), which produces strong winds drawn in toward the center of the burning area. These winds fan the flame and convert the area into a disaster in which everything flammable is destroyed.
It can be inferred that amount of radiation______.
A．is the greatest when atomic bomb is dropped from the air
B．is the weakest when it spreads over a large area
C．is the greatest when the atomic bomb goes off on the ground
D．becomes increasingly weak as it travels far out
Helium is not flammable and, next to hydrogen, is ______
A．known the lightest gas
B．lightest the known gas
C．the lightest gas known
D．the known gas lightest
Camphor oil is classified as a ______．
A.Grade A flammable liquid
B.Grade C flammable liquid
C.Grade D combustible liquid
D.Grade E combustible liquid
A.Less than the flammable range
B.Within the flammable range
C.Over the flammable range
D.The explosimeter is defective and giving a false reading
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