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初三课外练习化学选择题及答案20题

选择题课外练习答案化学
2024-05-16 21:12:07

初三课外练习化学选择题及答案20题1. Which of the following elements is a noble gas?  A) Oxygen  B) Hydrogen  C) Helium  D) CarbonAnswer: C2. The atomic number of an element determines its:&nbs...

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