正确答案: C

Ⅰ，Ⅱ都对

题目：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

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学习资料的答案和解析：

[单选题]增压器喘振的常见原因是（）。

流道阻塞

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

At the beginning of the compression stroke

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

compressed air

[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.

the cross-head

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

revolving

[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

(1)-(4)-(2)-(3)-(5)

[单选题]设X服从参数为λ>0的指数分布，其数学期望EX=（）

λ的倒数