铁梨木艉轴承的缺点是（）和（）等。

【名词&注释】

使用寿命(service life)、摩擦系数(friction coefficient)、滚动轴承、船用增压器(ship turbocharger)、效率高(high efficiency)、性能好(good performance)、增压器轴承(turbocharger ' s bearing)

[单选题]铁梨木艉轴承的缺点是（）和（）等。

A. 价格贵/来源少
B. 水润滑/轴包铜套
C. 价格贵/不耐磨
D. 不耐磨/易干裂

查看答案&解析 查看所有试题

学习资料：

[单选题]船用增压器轴承^{(turbocharger s bearing)}多采用滚动轴承，因其具有拆装方便，起动性能好^{(good performance)}、效率高、摩擦系数小等优点，但其缺点是（）。

A. 使用寿命有限制
B. 结构复杂
C. 损坏后易引起振动
D. 无法检修

[单选题]Which of the following may cause that an engine doesnt run on starting air?（）

A. too low starting air pressure
B. main start valve closed
C. neither A nor B
D. A and B

[单选题]The water in an auxiliary boiler should be tested for chloride content to determine （）.

A. total dissolved solids
B. salt contamination
C. water hardness
D. chlorine contaminatio

[单选题]Misalignment of the drive shaft and propeller shaft flanges can be detected by using a dial indicator or （）.

A. inside micrometer
B. feeler gauge
C. adjustable trammel
D. sighting device

[单选题]Combustion knock occurring in a diesel engine can be caused by （）.

A. excessive fuel penetration
B. prolonged injection lag
C. reduced ignition lag
D. prolonged ignition lag

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