正确答案: C

Ⅱ＋Ⅳ＋Ⅴ

题目：平板形舵具有（）的特点。Ⅰ.结构复杂；Ⅱ.便于修造；Ⅲ.舵效高；Ⅳ.舵效低；Ⅴ.成本低。

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学习资料的答案和解析：

[单选题]（）柴油机活塞运动部件在船上安装前必须先进行车间平台复验其相互位置精度。

新造或大修的主

[单选题]活塞销的主要损坏形式是（）。Ⅰ.磨损；Ⅱ.摩擦；Ⅲ.擦伤；Ⅳ.腐蚀；Ⅴ.裂纹。

Ⅰ＋Ⅴ

[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

仅Ⅱ对

[单选题]消除螺旋桨鸣音的具体办法是将桨叶随边0.4R～0.8R部分（）等抗鸣边缘，从而改变涡流引起的振动频率，也就不会与桨叶固有振动频率产生共振。Ⅰ.加厚；Ⅱ.减薄；Ⅲ.形成锯齿状；Ⅳ.质量改变；Ⅴ.钻孔。

Ⅰ＋Ⅱ＋Ⅲ＋Ⅴ

[单选题]The shells are secured by means of bearing caps and studs, the necessary clearance being provided by means of （） of different thickness.

shims

[单选题]The crankcase of many diesel engines are kept under a slight vacuum by the （）.

crankcase exhaust fa

[单选题]Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce（）.

carbon accumulation on the nozzles

[单选题]If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）.

leak in the primary cooling system

[单选题]What condition will result in the automatic shutdown of a diesel engine? （）

Low lube oil pressure