單項選擇題

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

你可能感興趣的試題

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

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

99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精