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what is the maximum blood alcohol concertration (BAC) rate on board ？

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During the dock repair, when installing the tail shaft and propeller, ____ should be on the spot for supervising

A. chief engineer
B. engineer
C. captain
D. any member of the engine department

In an auxiliary diesel engine bypass type lubricating oil system, the main lube oil pump forces_______ .

A. all of the oil used by the engine through a filter
B. some of the oil used by the engine through a filter
C. some of the oil used by the engine through a centrifuge
D. all of the oil used by the engine through a centrifuge

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假设美联储非常担心经济可能会进入衰退，美联储可能会采取什么政策？这种政策对实际GDP和价格水平又会有什么影响？

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一个同家的实际GDP以每年5％的速度增长了三个季度，然后减速到以每年0．5％的速度增长了三个季度，然后又回到5％的速度。这个国家是否经历了经济衰退？请解释。

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