问题描述：
[单选]
To minimize corrosion， fuel oil strainer disks， spacers and scraper blades are made of（）．
A．brass
B．copper
C．iron
D．monel metal or stainless steel
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答案解析：无
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下一篇：The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and（）．
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