Helium is not flammable and, next to hydrogen, is ______A、known the lightest gas

游客2025-02-06  2

问题 Helium is not flammable and, next to hydrogen, is ______

选项 A、known the lightest gas
B、lightest the known gas
C、the lightest gas known
D、the known gas lightest

答案 C

解析
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