单项选择题
A.Should knocking occur B.If knocking occur C.Should if knocking occurs D.If occur knocking
Grind the （）.A.keywayB.shaftC.packingD.valve
单项选择题Grind the （）.
Which of the following can be obtained by means of an i...
单项选择题Which of the following can be obtained by means of an indicator card?（）
A.the peak pressure in a cylinder B.the temperature of the cooling water C.the fuel consumption D.none of the above
The lower section of a piston is called the （）.A.landB....
单项选择题The lower section of a piston is called the （）.
A.land B.skirt C.crown D.plate
