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If found oil when we open low oil level plug of separator, it indicates ____.
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If oil density were greater than water’s, the oil separator _____.A.did workB.would work w
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The snakes will attack only if you take it ______ surprise.A．inB．byC．withD．on
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The ______ was that, if you had to abandon ship and had time to put on a dry suit, it woul
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If in doubt as to the true water level when a boiler is being oil－fired, you should _____.
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A centrifugal fuel oil purifier should be shut down if ________.A.more sealing water is ne
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If oil______on the frozen north coast in the 1960s, an 800-mile pipeline would not have be
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