问题描述：
[单选]
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
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答案解析：无
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上一篇：Pistons of marine medium speed diesel engines may be made of（）in order to keep the weight down for balancing purpose at high speed．
下一篇：Piston No2 of main engine has been removed， and it will be（）by noon tomorrow．
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