题目内容
邮政的生产始于收寄，终于_______。
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某铜选矿厂平均精矿产量Q k=200.0t/d，精矿品位β=25.0%，求一个月(30d)的精矿含铜量为多少？
永不言弃好吗
The expression “Never, never give up” means to keep trying and never stop working for your goals. Do you agree or disagree with this statement？ Use specific reasons and examples to support your answer.
教学评估体系
Schools should ask students to evaluate their teachers. Do you agree or disagree？ Use specific reasons and examples to support your answer.
助听器选择错误的是
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