发布时间:2025-01-31 02:47:15
甲醛的化学式为CH 2 O,是由碳、氢、氧三种元素组成,故A正确; 元素不能论个数,故B错; 分子是由原子构成的,故C错; 甲醛分子中碳、氢、氧原子个数比为1:2:1,而不是碳、氢、氧三种元素的质量比,故D错. 故选A. |
公积金当天交现金多久到账 quot公积金当天交现金能多久入账
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