单项选择题
A.exhaust valves B.starting valves C.fuel valves D.the indicator cocks
While engine is in operation the piston moves up and do...
单项选择题While engine is in operation the piston moves up and down, thus causing the rotation of the （）.
A.crankcase B.slipper C.cam housing D.crankshaft
Which of the following would cause a diesel to have bla...
单项选择题Which of the following would cause a diesel to have black smoke?（）
A.leaky injector B.water in the gas C.too heavy oil D.water in the oil
Which of the following will take place if the clearance...
单项选择题Which of the following will take place if the clearance of the main bearings are excessive?（）
A.bearing knocks B.dropping of pressure of LO C.noises D.all the above
