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【单选题】
观察PPD的时间为A.
12～24小时
B.
72小时后
C.
12小时
D.
48～72小时
E.
24～48小时
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反馈参考答案：
举一反三
【单选题】We have seen how the mixture of air and fuel is delivered by the fuel system to the engine cylinder, _________ it is compressed, ignited, and burned.
A.
when
B.
where
C.
that
D.
which
【单选题】The selection of an oil depends （） on the operating conditions, the design of the engine and the type of fuel to be burned.
A.
to a great extent
B.
on a great extent
C.
on mainly
D.
on only
【单选题】The piston then travels up through the cylinder and ( ) the burned fuel charge.
A.
opens
B.
closes
C.
exhausts
D.
none of above
【单选题】Because fuel is burned inside the engine cylinder, the engine is called an ____.
A.
engine
B.
internal combustion engine
C.
gasoline engine
D.
diesel engine
【简答题】As fuel is burned in the engine, about one-third of the heat energy in the fuel is converted into power.
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