中间轴承对轴系可靠性影响的主要因素是中间轴承的都不对（）。Ⅰ.

【名词&注释】

可靠性(reliability)、摩擦力(friction)、平均值(average)、主要因素(main factors)

[单选题]中间轴承对轴系可靠性影响的主要因素^{(main factors)}是中间轴承的都不对（）。Ⅰ.位置；Ⅱ.数量；Ⅲ.间距

A. Ⅰ+Ⅱ
B. Ⅰ+Ⅲ
C. Ⅱ+Ⅲ
D. Ⅰ+Ⅱ+Ⅲ

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学习资料：

[单选题]桨叶平均螺距为桨叶上各半径截面的（）的算术平均值。

A. 局部螺距
B. 截面螺距
C. 总平均螺距
D. 平均螺距

[单选题]操舵轻快、航向失控的原因可能是（）。Ⅰ.舵承配合间隙过大；Ⅱ.舵承损坏；Ⅲ.舵叶丢失；Ⅳ.舵杆折断；Ⅴ.舵承的摩擦力小。

A. Ⅰ＋Ⅱ
B. Ⅰ＋Ⅳ＋Ⅴ
C. Ⅱ＋Ⅳ＋Ⅴ
D. Ⅲ＋Ⅳ

[单选题]Each cylinder is closed at the top by a （）, made of a special heat-resistant steel.

A. cylinder liner
B. coupling flange
C. cylinder cover
D. piston crow

[单选题]It is very necessary that each cylinder （） before the charged air is compressed.

A. is scavenged
B. is atomized with fuel oil
C. be scavenged
D. be atomized with fuel oil

[单选题]The term （） refers to one complete sequence of operations required to produce power in an engine.

A. diesel engine
B. stroke
C. cycle
D. compression ratio

[单选题]A crankshaft whose center of gravity coincides with its center line is said to be （）.

A. dynamically balanced
B. statically balanced
C. counter balanced
D. resonantly balanced

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