试题与答案

实验室用如图所示的棕色试剂瓶盛装10%的硝酸银溶液.某同学用胶头滴管吸取少量硝酸

题型:填空题

题目:

实验室用如图所示的棕色试剂瓶盛装10%的硝酸银溶液.某同学用胶头滴管吸取少量硝酸银溶液,滴加到装有稀盐酸的试管中,然后,他用自来水将胶头滴管进行冲洗,再直接插入原试剂瓶中.在以上操作中,该同学有明显的错误.请问这些错误操作将会产生怎样的不良后果?指出两点:

(1)______;

(2)______.

答案:

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Edinburgh International Book Festival is the world’s biggest book festival. We present different programs for both adults and children including discussions, lectures, debates and workshops, all in one of Edinburgh’s most beautiful spaces, Charlotte Square Gardens.

Edinburgh International Festival

Time: 8th – 31st August 2008

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Edinburgh International Science Festival

Time: 25th March-5th April 2008

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A.are all about arts

B.all happen in 2008 only

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B.It is a place to buy and sell things.

C.It shows kinds of cultures in Scotland.

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