如机油油位太高将引起柴油机冒蓝烟，冒黑烟及（）等常见故障。
参考答案：机油油耗增加
Father went to his doctor for ______ about his heart trouble .
A． an advice
B．advice
C． advices
D．the advices
启动机连续启动三次以上应间歇（）分钟。
A.7
B.5
C.8
D.10
