舵杆工作轴颈与舵叶轴承孔同轴度检验前，先将舵杆与舵叶组装在一

【名词&注释】

冷却水(cooling water)、轴承座(bearing chock)、活塞杆(piston rod)、柴油机增压器(diesel supercharging)、二冲程低速、增压器涡轮(turbine wheel)

[单选题]舵杆工作轴颈与舵叶轴承孔同轴度检验前，先将舵杆与舵叶组装在一起，并使（）。

A. 舵杆与舵叶法兰结合面贴紧
B. 法兰连接螺栓中至少有4个紧配螺栓
C. 舵杆与舵叶法兰结合面贴紧或法兰连接螺栓中至少有4个紧配螺栓
D. 舵杆与舵叶法兰结合面贴紧和法兰连接螺栓中至少有4个紧配螺栓

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学习资料：

[单选题]废气锅炉的排气流动阻力不能过大，因为二冲程低速柴油机增压器后的排气背压规定一般不宜超过（）。

A. 0.003MPa
B. 300mmH，0
C. 3000Pa
D. A，B，C均可

[单选题]活塞裙外圆与活塞杆外圆的同轴度偏差应不大于（）。

A. 0.05mm
B. 0.10mm
C. 0.15mm
D. 0.20mm

[单选题]厚壁瓦欲自轴承座内盘出时，应从（）盘出。

A. 瓦口较薄端
B. 瓦口较厚端
C. 瓦口任意端
D. 有定位凸起端

[单选题]防止增压器涡轮^{(turbine wheel)}端壳体腐蚀的方法是（）。

A. 选用低硫燃油
B. 降低冷却水进口温度
C. 提高冷却水进口温度
D. 选用耐蚀材料

[单选题]Fuel is delivered into the combustion space by （）.

A. a cooling system
B. a lubricating system
C. an electric system
D. an injection system

[单选题]The conclusion that mechanical efficiency is always （） 100 percent is correct.

A. small than
B. more than
C. little than
D. less tha

[单选题]With the shell and cap assembled as for running, a check must be made that the clearance between the cap and the housing （）.

A. has a nip
B. is large enough
C. is zero
D. are suitable

[单选题]Friction developing between the moving parts of a governor, governor linkage and control valve will cause the governor to （）.

A. react with insufficient speed droop
B. fail to react to small speed changes
C. have excessive sensitivity to small speed changes
D. remain in the neutral positio

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