需保密的正式公文在眉首部分标注份数序号，其作用在于（）。 A._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

需保密的正式公文在眉首部分标注份数序号，其作用在于（）。

A.使版面布局合理，美观大方

B.便于公文登记、分发、清退，加强管理，表明责任

C.落实规定，发挥公文的凭证作用

D.明确权责，合理分工

答案

参考答案：B

填空题

从中选出适当的词组填空。

in front of, Martian, cutting hair, aliens, so-so, take a day off, got mad, argue, in good health, lunch

1. I saw four ________ come out of the UFO.
2. My teacher didn't say I was lazy. He said I was just ________.
3. A ________ is someone from the planet Mars.
4. I didn't agree with his idea, but I didn't tell him. I didn't want to ________ with him.
5. When the UFO landed in our garden, we were in the kitchen having ________.
6. Please don't worry about my grandparents. They are ________ and they are always happy.
7. While I was walking down Xing Street, the UFO landed right ________ me.
8. I was sitting in a barber chair and _______ when the barber's dog saw me and shouted at me.
9. In Korea, people usually ________ on Mid-Autumn festival.
10. My best friend _______ at me because I copied her homework.

填空题

如图所示，闭合导线框的质量可以忽略不计，将它从如图所示位置匀速向右拉出匀强磁场．若第一次用0.3 s拉出，外力所做的功为W₁，通过导线横截面的电荷量为q₁；第二次用0.9 s拉出，外力所做的功为W₂，通过导线横截面的电荷量为q₂，则 W₁ W₂，q₁ q₂ （填大于、等于或小于）