單項(xiàng)選擇題

Diesel engine cylinder head test cocks are used to（）

A.check cylinder lubrication prior to starting engine
B.connect exhaust gas analyzers to determine engine efficiency
C.pressure test cylinder heads to check for leaks
D.remove moisture accumulations from cylinder prior to starting

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單項(xiàng)選擇題

A turbocharged diesel engine will have an intake manifold pressure（）

A.constantly decreasing as engine load increase
B.constantly increasing as the amount of supercharging increases
C.approximately equal to exhaust manifold pressure at all times
D.approximately equal to atmospheric pressure at all times

單項(xiàng)選擇題

A leaking diesel engine fuel injector will cause（）

A.prolonged maintenance intervals
B.improved atomization
C.greater fuel economy
D.incomplete combustion