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高考化学模拟套题一一、选择题（每小题只有一个选项符合题意）１．１９９３年８月，国际原子量委员会确认，我国张青莲教授测定的锑原子量（１２１．７６０）为标准原子量。已知锑有两种以上天然同位素，则１２１．７６０是（）。Ａ．锑元素的质量与１２Ｃ原子质量的１／...
The college entrance examination chemistry simulation questions one by one, multiple-choice questions (only one option for each question meets the meaning of the question) In August of 1993, the International Atomic Weight Research Commission confirmed that the atomic weight (121.760) measured by Prof. Zhang Qinglian of our country is the standard atomic weight. It is known that there are two or more natural isotopes, then 121.760 is (). A. The quality of the crucible element and 1/12 of the 12C atomic mass