When the starting air valve closes on one cylinder, another starting air valve has （） opened on another cylinder whose piston has just commenced its downward stroke.

When the order （） is received from the bridge, the main...

单项选择题When the order （） is received from the bridge, the main air stop valve in the starting air line should be shut.

When the follower is on the base circle of the cam, the...

单项选择题When the follower is on the base circle of the cam, the pump plunger is at the （） of its stroke.

When a crankshaft has to be handled outside the engine,...

单项选择题When a crankshaft has to be handled outside the engine, it should be carefully supported in a manner which will avoid （） high bending moments on it.