为防止电渣焊漏渣，应事先准备好（）及时加以阻塞。A、泡沫塑料_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

为防止电渣焊漏渣，应事先准备好（）及时加以阻塞。

A、泡沫塑料

B、黄沙

C、石棉泥

D、木塞

答案

参考答案：C

改错题

此题要求改正所给短文中的错误。对标有题号的每一行作出判断：如无错误，在该行右边横线上画
一个勾（√）；如有错误（每行只有一个错误），则按下列情况改正：
此行多一个词：把多余的词用斜线划掉，在该行右边横线上写出该词，并也用斜线划掉。
此行缺一个词：在缺词处加一个漏字符号（∧），在该行右边横线上写出该加的词。
此行错一个词：在错的词下画一横线，在该行右边横线上写出改正后的词。
注意：原行没有错的不要改。

    I received your letter was dated April 16th the day
before yesterday. All of our family greatly delighted to
learn how you are getting along very well with your lessons.
Time passes quickly. After dozens of days, you'll
finish the middle school. What pleases us most is that you
do very well to make up your mind to enter in the college
entrance examination this summer. What wonderful it is!
Dad, as well as Mom and I, is with you. We wished
you to make better use of your time. The full preparations
you make, the surer of success you'll certain be.

1.________
2.________
3.________
4.________
5.________
6.________
7.________
8.________
9.________
10.________

单项选择题 A1/A2型题

CH50法是用于测定（）

A.C₃活性

B.C₄活性

C.C₃含量

D.总补体含量

E.总补体活性