对于活塞杆下端是方形法兰的机型如B&W，如只需解体活塞杆填

【名词&注释】

填料函(stuffing box)、活塞杆填料、安全操作规程、不符合(inconformity)、固定物(fixture)

[单选题]对于活塞杆下端是方形法兰的机型如B&W，如只需解体活塞杆填料函则不需吊出活塞，在曲轴箱内拆掉填料函的（）固定螺栓，用专用夹具夹住（），使整个填料函落在夹具的平板上，进行解体。

A. 外圈/活塞杆
B. 内、外圈/活塞杆
C. 外圈/填料函
D. 内、外圈/填料函

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学习资料：

[单选题]拆装螺母时，不符合安全操作规程的是（）。

A. 一手抓住固定物^(fixture)
B. 另一手力用推
C. 少用套筒或梅花扳手
D. 根据需要增加扳手延长套管的长度

[单选题]Aluminum pistons have （） coefficient of thermal expansion compared with those of cast iron.

A. higher
B. lower
C. the same
D. none of the above

[单选题]Among the rings of a piston the （） one is subjected to the greatest load and temperature.

A. bottom
B. middle
C. top
D. none of the above

[单选题]In a purifier, the interface between the liquid seal and the oil should be positioned as close as possible to （）.

A. the outlet of oil
B. the outlet of water
C. the bowl periphery
D. the center of bowl

[单选题]The pressure of pilot air is usually （） than that of starting air.

A. higher
B. lower
C. low
D. high

[单选题]The selection of a lubricating oil depends to a great extent on the operating conditions,（）.

A. the type of coolant
B. the design of the engine
C. the type of fuel to be burned
D. B and C

[单选题]Which of the following is a factor of fuel oil almost having nothing to do with the formation of combustion products?（）

A. setting point
B. ash
C. sulfur content
D. carbon residue

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