We must know such ______ (用来代表化学元素的符号). symbols as are used to represent chemica

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问题 We must know such ______ (用来代表化学元素的符号).

选项

答案 symbols as are used to represent chemical elements

解析 本题测试以as引出的定语从句及单词symbol和element。先行词前有such,so,the same,定语从句可用as引出。
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