A diesel engine with a combustion chamber located between the crowns of two pistons is known as a/an （）.<br>A:double-acting engine<br>B:opposed pistons engine<br>C:single-acting engine<br>D:horizontal acting engine

A diesel engine with a combustion chamber located between the crowns of two pistons is known as a/an （）.
A:double-acting engine
B:opposed pistons engine
C:single-acting engine
D:horizontal acting engine

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