问题描述：
[单选]
“The engine not obtaining the sufficient speed for firing” means that（）．
A．the start fails
B．the fuel pumps will be put into operation
C．the fuel valves are damaged
D．the combustion process will take over
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答案解析：无
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上一篇：The engine will fail to start unless（）．
下一篇：The engine may lose power or slow down during running， when this occurs， the first cause possible may be hot bearings and（）of the pistons in the cylinders．
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