Pistons may be made in （） in order to keep the weight down for balancing purposes at high speed.<br>A:cast iron<br>B:forged steel<br>C:stainless steel<br>D:aluminum alloy

Pistons may be made in （） in order to keep the weight down for balancing purposes at high speed.
A:cast iron
B:forged steel
C:stainless steel
D:aluminum alloy

出自：海船船员证

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