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Helium is not flammable and next to hydrogen

2022-08-05 16:59:50 问答库 阅读 170 次

问题详情

Helium is not flammable and, next to hydrogen, is ______
A.known the lightest gas
B.lightest the known gas
C.the lightest gas known
D.the known gas lightest请帮忙给出正确答案和分析,谢谢!

参考答案

正确答案:C

考点: