During working, when the piston is near the （）, the air ig

【名词&注释】

螺旋桨(propeller)、磨损量(wear loss)

[单选题]During working, when the piston is near the （）, the air ignites the fine spray of fuel.

A. TDC
B. DTC
C. BDC
D. BCD

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学习资料：

[单选题]将主轴颈下沉量视为主轴承下瓦的磨损量是由于（）。

A. 主轴颈无磨损
B. 忽略曲轴主轴颈的磨损量
C. 二者磨损相同
D. 主轴承下瓦磨损量大

[单选题]为了检验螺旋桨的螺距应计算出（）。Ⅰ.局部螺距；Ⅱ.螺旋桨总螺距；Ⅲ.截面螺距；Ⅳ.桨叶平均螺距；Ⅴ.螺旋桨总平均螺距。

A. Ⅰ＋Ⅱ
B. Ⅰ＋Ⅲ＋Ⅳ＋Ⅴ
C. Ⅲ＋Ⅳ＋Ⅴ
D. Ⅰ＋Ⅱ＋Ⅲ＋Ⅳ

[单选题]As a heat engine,（） energy is the source of power by which the diesel engine can be operated.

A. electric
B. heat
C. mechanical
D. exhaust

[单选题]The gudgeon pin is carried in （） in the piston skirt.

A. the bearing
B. the crosshead
C. bosses
D. bridge

[单选题]In a simple mechanical governor, the （）.

A. centrifugal force rotates the ball-head
B. flyweight centrifugal force is balanced by spring force
C. flyweight centrifugal force is balanced by hydraulic pressure
D. speeder spring alone actuates the fuel control rod

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