正确答案: A

the column

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

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学习资料的答案和解析：

[单选题]关于螺旋桨鸣音，下列不正确的说法是（）。

导边涡流激振力引起的桨叶振动

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

sealed off

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

excessive air