招标人对已发出的招标文件进行必要的澄清或修改的，应当在招标文

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问题单项选择题

招标人对已发出的招标文件进行必要的澄清或修改的，应当在招标文件要求提交投标文件截止日期至少（）目前，以书面形式通知所有招标文件收受人。

A．7

B．14

C．15

D．20

答案

参考答案：C

填空题

Most international students are between the ages of 16 and 20 or even o 1 . These are the r 2

ages for young people to look after themselves. International students will f 3 two problems:

independence (独立) and study.

Firstly, It's very important for international students to have independence. If they always ask for

help from their p 4 , They will be a 5 most of the time when they study aboard.

Secondly, international students study h 6 than they do at home. They not only study more

d 7 subjects but also have to study a f 8 language to understand their teachers and the b 9 which

they use.

So it's not e 10 to study abroad. They must overcome (克服) the two problems if they study

aboard.

填空题

从三视图可以看出，左视图反映了物体的（）和宽度。