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單項(xiàng)選擇題

The color of the exhaust from a diesel engine should be （）

A.clear
B.hazy light brown
C.hazy light blue
D.hazy light grey

單項(xiàng)選擇題

Scavenging in a four-stroke/cycle diesel engine occurs during the （）.

A.last part of the exhaust stroke, and the first part of the intake stroke
B.last part of the intake stroke only
C.early part of the injection stroke only
D.early part of the power stroke