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【单选题】
为了测定水中Ca 2+ ，Mg 2+ 的含量，以下消除Fe 3+ 、Al 3+ 干扰的方法中，哪一种是正确的（）A.
于pH=10的氨性溶液中直接加入三乙醇胺
B.
于酸性溶液中加入KCN，然后调至pH=10
C.
于酸性溶液中加入三乙醇胺，然后调至pH=10的氨性溶液
D.
加入三乙醇胺时，不需要考虑溶液的酸碱性
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举一反三
【简答题】两个亲本杂交后,双亲杂交种 F1 再与亲本之一再连续杂交的方式叫( )。
【判断题】Except for remarks that will be recorded by the press or used in legal proceedings, a good rule of thumb is: “Don’t read your presentation.”
A.
正确
B.
错误
【判断题】The front desk is divided into several equally equipped workstations. The number of workstations depends on the size of the hotel. A good rule of thumb is 1 workstation per 500 guest rooms.
A.
正确
B.
错误
【单选题】A front desk is divided into several equally equipped workstations. According to the article, the number of workstations depends on the size of the hotel. However, a good rule of thumb is 1 workstat...
A.
10
B.
50
C.
100
D.
250
E.
500
【简答题】How to Make Attractive and Effective PowerPoint Presentation s A) Microsoft PowerPoint has dramatically changed the way in which academic and business presentations are made. This article outline s fe...
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