单项选择题
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
单项选择题 Misfiring in a diesel engine at light loads can be caused by（）
单项选择题 In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in （）
单项选择题 When a diesel engine compression pressure is checked, the indicator is connected to the （）
