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问题 判断题

三确认制是：确认、确信、确实。

答案

参考答案：对

选择题
Peter had intended to take a job in business, but _____ that plan after the unpleasant experience in Canada in 2010.
A．had abandonedB．abandonedC．abandonD．will abandon
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问答题 简答题

化学助剂的种类？
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