单选题Since the burning or combustion takes place within the engine itself, the engine is known as （）.Aa fire -tube boilerBan internal combustion engineCan external combustion engineDan internal combustion generator
单选题
Since the burning or combustion takes place within the engine itself, the engine is known as （）.
A
a fire -tube boiler
B
an internal combustion engine
C
an external combustion engine
D
an internal combustion generator
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