下列化学符号中表示正确的是a.2个镁原子 2mgb.钙离子 Ca 2c.2个氧原子 O2d.氯化铝 A1c1——青夏教育精英家教�—— Template




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tomski下列化学符号中表示正确的是a.2个镁原子 2mgb.钙离子 ca coloring