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问答题
对制冷剂有哪些主要的热力学性能要求？
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The vessel must carry only the lights that comply with the rules; the others may be omittedB
The vessel's lights must comply as closely as possible，as determined by her governmentC
The vessel must be altered to permit full compliance with the rulesD
An all-round light should be substituted for the after masthead light and the stern light
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ⅠB
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单选题Right ascension is primarily used by the navigator for（）.A
calculating amplitudesB
calculating great circle sailings by the Agiton methodC
entering the Air Navigation Tables (Selected Stars) Pub 249D
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单选题比例阀具有如下特性（）。A
输入压力小于控制压力时，输出压力等于控制压力B
输入压力大于控制压力时，输出压力等于输入压力C
输入压力不等于零，控制压力等于零时，输出压力等于零D
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ballast pumpC
air-conditioning water pumpD
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metacentric heightB
displacementC
righting momentD
inclining moment
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1）—6）
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变大/变大C
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maintaining a steadier speedB
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