螺旋桨与尾轴连接处扭矩的传递是依靠（）。Ⅰ.键与键槽的过盈配合

【名词&注释】

螺旋桨(propeller)、摩擦力(friction)、不平衡(unbalance)、增压器(turbocharger)

[单选题]螺旋桨与尾轴连接处扭矩的传递是依靠（）。Ⅰ.键与键槽的过盈配合；Ⅱ.压紧接合锥面产生的摩擦力

A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ+Ⅱ
D. Ⅰ，Ⅱ都不对

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学习资料：

[单选题]引起增压器^{(turbocharger)}振动的原因有（）。Ⅰ.轴承损坏；Ⅱ.转子弯曲变形；Ⅲ.转子冷却不良；Ⅳ.转子不平衡；Ⅴ.油泵安装不良。

A. Ⅱ＋Ⅳ＋Ⅴ
B. Ⅰ＋Ⅱ
C. Ⅰ＋Ⅱ＋Ⅴ
D. Ⅰ＋Ⅱ＋Ⅳ

[单选题]The piston ring grooves for a standard engine are （）

A. chromium-plate against wear
B. anti-corrosion treated
C. white metal lined against wear
D. flame hardened against wear

[单选题]The rate of cylinder lubricating oil metered to each cylinder of a large low-speed main propulsion diesel engine is （）

A. the same, whether at sea, or during maneuvering
B. adjusted during each hour of operation while at constant RPM
C. higher at sea than while maneuvering
D. lower at sea than while maneuvering

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