Large pipes or _____ are fitted between the steam and water drums to ensure good natural c

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Large pipes or _____ are fitted between the steam and water drums to ensure good natural circulation of water.

A.fire-tubes

B.furnaces

C.down-comers

D.soot-blowers

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。