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问题 单项选择题

1LpH=6和1LpH=8的盐水溶液混合后其溶液的[H+]等于（）。

A、10-7

B、10-6

C、10-8

D、10-7.5

答案

参考答案：A

单项选择题

依法必须进行招标的项目，招标人应当自确定中标人之日起( )日内，向有关行政监督部门提交书面报告。

A．10

B．15

C．20

D．30
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问答题

Directions:

Having finished his end-of-term exams, a university student has gone straight home without saying good bye to his roommate.

Write a letter explaining the situation to the latter, and invite him home during the vacation.

You should write about 100 words on ANSWER SHEET 2. Do not sign your own name at the end of the letter. Use "Li Ming" instead. You do not need to write the address.
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