單項(xiàng)選擇題

0ne of the principal dangers inherent in liquified petroleum gas is（）.

A.as it warms up it becomes heavier than air
B.the way it reacts with sea water
C.the strong odor it produces
D.its low temperature causes frostbite or freezing

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單項(xiàng)選擇題

0pen ullage holes in tanks which are not gas-free must be protected by（）.

A.PV valves
B.warning signs
C.flame screens
D.stop-check valves

單項(xiàng)選擇題

0ur starboard derrick boom of hatch No.4 is baddly cracked（）that it has become entirely useless.

A.at its goose neck to such a extent
B.at it's goose neck to such an extent
C.at it's goose neck for such a extent
D.at its goose neck to such an extent

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