Pistons of marine medium speed diesel engines may be made of （） in order to keep the weight down for balancing purpose at high speed.<br>A:lead<br>B:forged steel<br>C:alloy steel<br>D:aluminum alloy

Pistons of marine medium speed diesel engines may be made of （） in order to keep the weight down for balancing purpose at high speed.
A:lead
B:forged steel
C:alloy steel
D:aluminum alloy

出自：海船船员证

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