A diesel engine is similar to a gasoline engine except that

【名词&注释】

预热器(preheater)、活塞环(piston ring)、金属环(metal ring)、密封圈(seal ring)、不低于(no less than)

[单选题]A diesel engine is similar to a gasoline engine except that the former has no （）.

A. cross-head
B. cylinder
C. connecting rod
D. spark plug

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[单选题]关于废气锅炉烟垢着火温度（）。Ⅰ.烟垢潜在着火温度一般为300—400℃；Ⅱ.存在未燃烧的燃油时烟垢着火温度约为150℃；Ⅲ.极端情况下甚至低到120℃仍可发生烟垢着火

A. Ⅰ+Ⅱ
B. Ⅰ+Ⅲ
C. Ⅱ+Ⅲ
D. Ⅰ+Ⅱ+Ⅲ

[单选题]废气锅炉废气出口温度不低于^{(no less than)}155℃，锅炉进口给水循环温度，对有预热器的应高于（）℃，否则凝结的硫酸可使烟灰有粘性，增加烟垢形成的趋势。Ⅰ.120—130；Ⅱ.110—120；Ⅲ.100—110

A. 仅Ⅰ对
B. 仅Ⅱ对
C. 仅Ⅲ对
D. Ⅰ+Ⅱ+Ⅲ

[单选题]曲轴臂距差的符号表明曲轴（）。

A. 受力程度
B. 受力方向
C. 弯曲变形方向
D. 应力性质

[单选题]轴系两端轴产生同轴度偏差可采用（）进行检测。

A. 指针法
B. 直尺-塞尺法
C. 平轴法
D. 平轴法或平轴计算法

[单选题]Simplex艉轴密封装置采用的密封圈是（）。

A. 金属环
B. 活塞环
C. 橡胶环
D. “O”形圈

[单选题]舵承孔同轴度偏差过大时，可采取（）措施。

A. 更换舵承衬套
B. 偏镗舵承孔衬套
C. 衬套需可靠定位以防转动
D. 镗削全部舵承衬套

[单选题]Fuel pump index is （）.

A. the viscosity index
B. the fuel oil contents
C. the starting speed
D. the reading at the rack

[单选题]In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）, there being an adequate overlap between the inlet opening and the exhaust closing.

A. downwards；upwards
B. upwards；downwards
C. downwards；downwards
D. upwards；upward

[单选题]As to the piston cooling, of the following, which statement is not true?（）

A. Because the piston is exposed to very high temperature, it must be cooled
B. The lower the piston cooling temperature is, the better it is
C. Both water and lube oil can be used as coolant
D. One of the piston cooling methods is vibration cooling, with better effect

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