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问题

Fire hose couplings ______.A.are made of bronze b


Fire hose couplings ______.

A.are made of bronze brass, or soft alloy metals

B.should be painted red in order to identify hose lengths

C.are specially hardened to prevent crushing

D.should be greased frequently

请帮忙给出正确答案和分析,谢谢!

参考答案
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