【名词&注释】
摩擦力(friction)
[单选题]() neutralizes the acid conditions and() cleanses the rings and grooves.
A. The detergency;the alkalinity
B. The alkalinity;the detergency
C. The inhabitant;the water
D. The additives;the distilled water
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学习资料:
[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]Failure of fuel injection is usually due to trouble in the ().
A. exhaust valves
B. mechanical lubricators
C. cooling water pumps
D. fuel injection pum
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