Because the castings of smaller engines are not so big and h

【名词&注释】

固有频率(natural frequency)、螺旋桨鸣音、实质上(in essence)

[单选题]Because the castings of smaller engines are not so big and heavy, （） and cylinder block may be made in one piece.

A. the column
B. the jacket
C. cylinder cover
D. cylinder liner

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学习资料：

[单选题]关于螺旋桨鸣音，下列不正确的说法是（）。

A. 在螺旋桨工作时发出的“嗡嗡”的响声
B. 导边涡流激振力引起的桨叶振动
C. 实质上是共振
D. 随边0.4R以外部位的涡流引起的振动频率与桨叶固有频率接近所致

[单选题]During repair,lubrication lines and orifices must be （）.

A. taken away
B. engaged
C. connected
D. sealed off

[单选题]The rising of the exhaust temperature in manifold pipe may NOT result from （）.

A. too great a loading
B. fouled turbocharger
C. bad combustion
D. excessive air

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