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單項選擇題

An auxiliary diesel engine may fail to start due to（）

A.low exhaust back pressure
B.high lube oil temperature
C.insufficient cranking speed
D.excessive fuel atomization

單項選擇題

Diesel engine exhaust noise can be reduced in an exhaust muffler by （）

A.changing the direction of exhaust gas flow
B.increasing the exhaust gas velocity
C.changing the exhaust gas weight
D.increasing the exhaust gas static pressure