單項選擇題

Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）

A.closing later
B.opening sooner
C.staying open for a shorter period of time
D.staying open for a longer period of time

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A diesel engine crankcase ventilation system （）

A.prevents spark generation
B.removes combustible gases
C.determines the level of combustible gases
D.provides inert gas generation in crankcase

單項選擇題

Regarding a Diesel engine crankcase, the general arrangement and installation should preclude the possibility of （）

A.free entry of air to the crankcase
B.water entering the crankcase while engine wash-downs are being performed
C.excessive oil leakage during periods of increased blow-by
D.sub-cooling internal components