柴油机排气系统的背压与（）。Ⅰ.废气流速的平方成正比；Ⅱ.与管径

【名词&注释】

柴油机(diesel engine)、指数分布(exponential distribution)、增压器喘振(turbocharger surge)

[单选题]柴油机排气系统的背压与（）。Ⅰ.废气流速的平方成正比；Ⅱ.与管径的4次方成反比

A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ，Ⅱ都对
D. Ⅰ，Ⅱ都不对

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学习资料：

[单选题]增压器喘振的常见原因是（）。

A. 叶片折断
B. 轴承损坏
C. 流道阻塞
D. 转子变形

[单选题]（） the cylinder will contain a great weight of air and will be capable of burning a great quantity of fuel.

A. At the beginning of the compression stroke
B. At the beginning of the suction stroke
C. At the end of the working stroke
D. At the end of the exhaust stroke

[单选题]Diesel engines are started by supplying （） into the cylinders in the appropriate sequence for the required direction.

A. fuel oil
B. diesel oil
C. compressed air
D. jacket water

[单选题]The lower end of each piston rod is reduced in diameter to fit a bore in （）, this being secured to the piston rod by a nut.

A. the crank-web
B. the connecting rod
C. the main bearing
D. the cross-head

[单选题]The piston moving up and down keeps the crankshaft （）.

A. to revolve
B. revolved
C. revolving
D. to be revolved

[单选题]The sequence of parts in a generally used fuel oil supply system for a main engine is （）(1)tanks in the double bottom(2)centrifuges(3)service tank(4)settling tank(5)viscosity regulator

A. (1)-(2)-(4)-(3)-(5)
B. (1)-(4)-(2)-(3)-(5)
C. (1)-(3)-(2)-(4)-(5)
D. (1)-(5)-(4)-(2)-(3)

[单选题]设X服从参数为λ>0的指数分布，其数学期望EX=（）

A. λ
B. λ的倒数
C. λ的平方
D. λ的负数

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