How many workers were killed in the methane explosion?A.4.B.13.C.17.D.18.

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How many workers were killed in the methane explosion?

A.4.

B.13.

C.17.

D.18.

请帮忙给出正确答案和分析,谢谢!

热搜:在公制与英制换算中,1in等于()。