单项选择题
If exhaust temperatures are too high, you should check （）.
A.air cooler B.turbocharger C.charge air D.A+B+C
单项选择题 Defective timing gear in a diesel engine may lead to （）.
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 （）.
