The ship called at many ________ last voyage

【名词&注释】

相容性(compatibility)、四冲程柴油机(four-stroke diesel engine)

[单选题]The ship called at many ________ last voyage

A. country
B. countries
C. countrys
D. countryses

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学习资料：

[单选题]货物的相容性是指()。

A. 货物之间的反应可能
B. 货物本身的稳定性
C. 货物与环境之间的影响

[单选题]下面的单位换算中，错误的是( )。

A. 1kcal/s=4.186kw
B. 1kW=1.34HP
C. 1Pa=1N/㎡
D. 1bar=103Pa

[单选题]"Stand by an engine" means

A. "prepare to stop the engine"
B. "assemble an engine on its bedplate"
C. "make an engine ready for starting"
D. "dismantle an engine"

[单选题]一台六缸四冲程柴油机的发火间隙角是()

A. 120°
B. 180°
C. 240°
D. 60°

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