皮皮学，免费搜题
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【简答题】
柴油机排黑烟的主要原因多为空气滤淸器堵塞、排气制动阀（），喷油时间过早，喷油器不良，气缸压力过低。
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】We (strongly) suggest (that) Smith (is told) about (his) physical condition as soon as possible.
A.
strongly
B.
that
C.
is told
D.
his
【单选题】I strongly suggest you ______________. It's not good for your health.
A.
break the habbit of staying up.
B.
make staying up a habit.
C.
get into the habit of staying up.
D.
to break the habit of staying up.
【简答题】空气中的水汽要凝结的前提条件是_,_
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