题目内容
The automobile engine is an ______ combustion engine.
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In some engines, the cylinder_____ also carries the camshaft .
These four strokes are intake stroke, _____ stroke, power stroke and exhaust stroke.
The intake stroke ______ at top dead centre with the intake valve open and the exhaust valve closed.
The piston moves _____to draw a charge of air-fuel mixture into the cylinder through the open intake port.
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