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单选题
夜间在海上航行，两机动船航向接近相反时，最易造成行动不协调而发生碰撞的情况是：（）
A
当头对遇
B
左对左，且横距不宽裕
C
右对右，且横距不宽裕
D
两船航向成半个罗经点左右的较小交角
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sudden evaporation of wax crystals in the lubricantB
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release of dissolved lubricant from the refrigerant
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he will carry out the inspection without informing the master
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单选题我国《海船船员适任考试、评估和发证规则》中关于申请适任证书者应符合的基本条件，下列哪项并不合适（ ）。A
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keep air cushion in oil collecting space during runningC
check oil level during runningD
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一章/A部分、C部分B
三章/A部分、B部分C
五章/A部分、C部分D
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单选题Which of the following statements is true concerning the cetane number of diesel fuel?（）A
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The cetane number is an indication of the fuels viscosityC
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判断题齿轮泵排量的不均匀度取决于齿轮的形状和转速。A
对B
错
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