单项选择题

All diesel engines are classified as ______．
A.Four cycle
B.Compression ignition
C.Vacuum ignition
D.External combustion

A.A.Four
B.Compression
C.Vacuum
D.External
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单项选择题
下列哪种嫁接方法不适合机械化嫁接_____。
A．靠接
B．贴接
C．套管嫁接
单项选择题
All marine low-speed diesels are of what design ________．A.Four-strokeB.Two-strokeC.Electronic ignitionD.Forced exhaust
A.A.Four-stroke
B.Two-stroke
C.Electronic
B.Forced
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