中间轴承有（）。Ⅰ.上瓦和下瓦D.仅有下瓦；Ⅲ.上下瓦可以互换

【名词&注释】

增压器(turbocharger)、二冲程柴油机(two-stroke diesel engine)、静平衡试验(static balance test)

[单选题]中间轴承有（）。Ⅰ.上瓦和下瓦D.仅有下瓦；Ⅲ.上下瓦可以互换

A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ+Ⅲ
D. Ⅰ或Ⅲ

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学习资料：

[单选题]体现主机紧急倒车性能的指标是（）。

A. 船舶由全速前进变为倒航所需的时间
B. 船舶由全速前进变为船速为零所需滑行的距离
C. 主机由全速前进转速降为转速为零所需的时间
D. A或B

[单选题]水润滑式艉轴的（）包覆铜套，以防止腐蚀。

A. 工作轴颈
B. 非工作轴颈
C. 2/3轴颈长度上
D. 轴颈全长

[单选题]静平衡试验后，较轻桨叶上的挂重大于允许值，则应铲去（）附近金属。

A. 较重桨叶叶背边缘
B. 较重桨叶叶面边缘
C. 较轻桨叶叶背边缘
D. 较轻桨叶叶面边缘

[单选题]增压二冲程柴油机当增压器损坏无法使用而使用辅助或应急鼓风机时，其运转功率与转速的降低程度主要应考虑的因素是（）。Ⅰ.排气温度；Ⅱ.柴油机振动；Ⅲ.排气颜色；Ⅳ.柴油机运转状态

A. Ⅰ＋Ⅱ＋Ⅲ
B. Ⅰ＋Ⅲ＋Ⅳ
C. Ⅱ＋Ⅲ＋Ⅳ
D. Ⅰ＋Ⅱ＋Ⅳ

[单选题]In a complete oil/water separator, more oil will separate out onto the underside of these plates and travel outwards until it is free to rise into the oil collecting space Whats the meaning of "it" in the sentence above?（）

A. a separator
B. oil
C. water
D. an oil collecting space

[单选题]The lubricating system for the cylinder walls is different from the bearings in that the oil for former one is supplied in （） while that for latter one is （）.

A. sufficient quantity； measured
B. measured quantity；sufficient
C. excessive quantity；sufficient
D. the less quantity the better；the more the better

[单选题]There is an injection pump for each cylinder, which is usually operated once every cycle by （） on the camshaft.

A. a gear
B. a cam
C. a rod
D. a miler

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