球蘑机的工作转速一般比临界转速（）。 A.大 B.小 C.相等 D.零 发布时间：2018-02-03 21:19 │ 来源：www.tikuol.com 题型：单项选择题 问题： 球蘑机的工作转速一般比临界转速（）。A.大B.小C.相等D.零
题型：单项选择题 完形填空。 Tom is six now. His mother __1__ in a factory. She's busy all the time. She must __2__ at six in the morning. Then she cooks __3__ for her family. She goes to work with some __4__. So she can have lunchin the factory. At six she comes back and cooks supper __5__. After she does some housework, she often __6__ she's tired. So she wants to have a good holiday. "What do you want for a holiday?" "I want to have a good rest." says the woman, "I can take you to the zoo to see __7__." Tom likes the dolphins very much and __8__ wants to see the elephants. September is coming and a new __9__ begins. His mother asks, "Would you like to go to school, my dear?" "I'd love to." says the boy. "__10__ I'm going to have a holiday, too."( )1. A. lives ( )2. A. go to work( )3. A. breakfast ( )4. A. books ( )5. A. at home ( )6. A. speaks ( )7. A. flowers ( )8. A. too ( )9. A. day ( )10. A. And B. works B. go to bed B. supper B. paper B. at school B. talks B. pictures B. to B. week B. Then C. studies C. get up C. lunch C. water C. at work C. says C. trees C. also C. term C. But D. plays D. get on D. meal D. food D. on the farm D. tells D. animals D. can D. month D. or 查看答案
题型：单项选择题 输入设备用于向计算机输入命令、数据、文本、声音、图像和视频等信息，其中命令信息是用户向计算机发出的操作请求。下面是一组PC机常用的输入设备： ①笔输入设备 ②键盘 ③鼠标 ④触摸屏 以上输入设备中，哪些可用来输入用户命令信息A．①、②、③和④B．①、②和③C．②和③D．②和④ 查看答案