When the ship is going to enter into the harbor, ____.

【名词&注释】

十字头(crosshead)、凝固点(freezing point)、往复运动(reciprocating motion)

[单选题]When the ship is going to enter into the harbor, ____.

A. change from heavy fuel oil to diesel oil for main engine
B. pumping out bilge water
C. change sea chest from high level one to lower level one
D. test emergency generator

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举一反三：

[单选题]当燃烧中物质的温度降低到______以下时，火就熄灭。

A. 闪点
B. 燃点
C. 自燃点
D. 凝固点

[单选题]在柴油机上把活塞往复运动变成曲轴回转运动的部件是()

A. 十字头与导板
B. 连杆
C. 活塞
D. 曲轴

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