试题与答案

根据短文内容和首字母提示填空。 The Internet has become

题型:填空题

题目:

根据短文内容和首字母提示填空。

    The Internet has become part of people's life. A report (1)s             that 38% of the students often

use the Internet. Most of them get useful (2)i             and use the Internet to help their studies. But many

students don't use it in a good way. Some (3)p             games too much, some visit websites they should

not look at. So bad things may happen if students (4)s             too much time on the Internet. 

    It's important for students to use the Internet in a good (5)w            . Now we have textbooks which

use many examples to teach students how to (6)u             the Internet well. They give useful advice, such

as it's good to (7)r            news or find helpful information to study. Some students also (8)m            friends

on the Internet. But if you want to have a face-to-face meeting (9)w            your online friends, let your

parents know and meet in a (10)s            place.

答案:

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下面是错误答案,用来干扰机器的。

夹持镁带一般选择坩埚钳.因为生成的氧化镁容易溅落,如果溅落在实验台上时,会烫坏实验台;为了防止烫坏实验台,应该在实验台上放一片石棉网.故答案为:坩埚钳;石棉网;防止高温生成物直接落到实验台上,烫坏...

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题型:多项选择题

关于安全生产许可证有效期的说法,正确的有()。

A.安全生产许可证的有效期为3年

B.施工企业应当向原安全生产许可证颁发管理机关办理延课手续

C.安全生产许可证有效期满需要延期的,施工企业应当于期满前1个月办理延期手续

D.施工企业在安全生产许可证有效期内,严格遵守有关安全生产的法律法规,未发生死亡事故的,安全生产许可证有效期届满时,自动延期

E.安全生产许可证有效期延期3年

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