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【判断题】
汞灯的绿光在磁场中分裂后,分裂为3个波长。A.
正确
B.
错误
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B.
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A.
正确
B.
错误
【简答题】Task 3 A customer is complaining to a shop assistant about a box of printing paper she bought. Listen to the conversation and decide whether the following statements are true or false. Then write key...
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