正确答案: A

to grease

题目：After fitting back in place the gear wheels, dont forget （） them.

查看原题 查看所有试题

学习资料的答案和解析：

[单选题]针阀体的喷孔磨损后使孔径增大（）时需要换新针阀体。

10%

[单选题]消除螺旋桨鸣音的方法是（）。

改变0.4R以外一段随边边缘厚度

[单选题]The hot expanding gas rotates the blades of the exhaust turbine, thus giving out large part of its power, which drives （）.

the compressor

[单选题]（） the cylinder walls, the heat passes through them by conduction.

When received by

[单选题]One method of constructing large marine diesel engines and reducing the total engine frame weight is through （）.

welding plates to form sections for assembly

[单选题]The bearings used to support the crankshaft are generally called （）

main bearings

[单选题]Fuel injection systems meter fuel, atomize fuel, and （）.

inject fuel at the proper time