单项选择题
Defective timing gear in a diesel engine may lead to （）.
A.smoky exhaust B.starting failure C.overload D.over speed
单项选择题 Defective governor in a diesel engine may lead to （）.
单项选择题 Defective air cooler in a diesel engine will lead to （）.
单项选择题 Defective atomizer in a diesel engine will lead to（）.
