单选题Pistons may be made in （） in order to keep the weight down for balancing purposes at high speed.Acast ironBforged steelCstainless steelDaluminum alloy
单选题
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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