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?
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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
A. 小儿应首选耳背式助听器,佩戴方便,功率大小具有灵活性
B. 小儿应首选数字式助听器,能有效的保护残余听力,分辨率高,佩戴舒适
C. 助听器的输出一定控制在不舒适阈以下
D. 助听器的输出和当时的听力损失相适应就可以了
E. 为防止“听力剥夺”现象的发生,小儿应坚持双耳同时佩戴助听器
助听器随访正确的是
A. 成人第一年半年一次
B. 成人一年以后一年一次
C. 儿童第一年应每三个月查一次
D. 儿童一年以后一年一次
E. 随访时间凭直觉走