题目内容

【B16】

A. in
B. as
C. to
D. at

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When an oil fire has been extinguished, the surface of the oil should be kept covered with

A. air from contacting the oil vapors
B. permitting re-ignition boiling of the heated oil
C. spontaneous combustion below the oil surface
D. toxic fumes from escaping to the surface

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【B14】

A. abundant
B. magnificent
C. expensive
D. extravagant

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【B15】

A. nevertheless
B. therefore
C. thereafter
D. however

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【B13】

A. catastrophe
B. disturbance
C. impact
D. insertion

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【B16】

A. in B. as C. to D. at

When an oil fire has been extinguished, the surface of the oil should be kept covered with

【B14】

【B15】

【B13】

A. in
B. as
C. to
D. at