【名词&注释】
使用性能(service performance)、螺旋桨桨叶(propeller blades)、寿命短(short life)、填料函式
[单选题]填料函式密封装置的缺点是()。Ⅰ.密封效果差;Ⅱ.摩擦损失大;Ⅲ.易伤艉轴或铜套;Ⅳ.使用性能差;Ⅴ.寿命短。
A. Ⅱ+Ⅲ
B. Ⅰ+Ⅱ+Ⅳ+Ⅴ
C. Ⅲ+Ⅳ+Ⅴ
D. Ⅱ+Ⅲ+Ⅳ
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学习资料:
[单选题]底脚螺栓与机座和底座的连接方式是()连接。
A. 刚性
B. 柔性
C. 弹性
D. 塑性
[单选题]鸣音发生在螺旋桨桨叶()以外的随边边缘。
A. 0.3R
B. 0.4R
C. 0.5R
D. 0.6R
[单选题]The fuel oil pressure and forced draught pressure should be matched to ensure good combustion with a full steady flameIn the sentence the word “match” means ()
A. join with
B. mix
C. be equal to
D. be constant
[单选题]What function is provided by the crankcase ventilation system on some diesel engines?()
A. Increases the sludge forming tendency of lube oil
B. Prevents the accumulation of combustible gases
C. Improves lube oil cooling
D. Improves cold weather starting
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