【单选题】控制按钮的作用主要是( )。
A.
发布命令控制其它电器的动作和短时接通或断开小电流电路
【简答题】听对话,根据所听内容选择正确的答案,读两遍。 1. Does Eric like hamburgers and fried chicken? A. Yes, he does. B. No, he doesn't. C. I don't know. 2. Who likes junk food very much? A. Eric's sister. B. Eric. C. Emma. 3. Doe...
【单选题】用作短时间接通或断开小电流控制电路,以改变控制系统工作状态的常用电器是
【简答题】根据所听内容选择正确的句子,并在正确答案后的括号内画 '√'。 1. The robot is eleven yuan . ( ) The robot is twenty yuan. ( ) 2. Whose walkman is this? ( ) Whose diskman is this? ( ) 3.These books are Lulu's. ( ...
【简答题】听句子。根据所听内容选择正确的应答语。 ( )1. A. I'm happy. ( )2. A. In 1990. ( )3. A. It is like a cat. ( )4. A. June. ( )5. A. Yes, please. B. Merry Christmas! B. Since 1990. B. It is cloudy. B. Jun...
【简答题】听录音,根据所听内容选择正确的答语。 ( )1. A. I like playing the piano ( )2. A. No, I'm not. ( )3. A. Good idea. ( )4. A. Sounds good. ( )5. A. All right. ( )6. A. He's in the study. B. I'd like...
【简答题】按钮开关通常用作短时接通或断开小电流的( )开关,用于控制电路中发出( )或停止等指令,通过接触器、继电器等控制电器接通或断开主电路。 行程开关又称限位开关,是根据运动部件位置而切换电路的自动控制电器。动作时,由挡块与行程开关的滚轮相碰撞,使触头( )或断开用来控制运动部件的运动方向、行程大小或( )保护。
【简答题】听短文。根据所听内容选择正确的答案。短文读两遍。 1. In the past, most Chinese people had _____ at night. A. a big meal B. a light supper C. a big supper 2. Why is takeaway food popular in big cities of China? A. Because peop...
【简答题】听对话,根据所听内容选择正确的答案,读两遍。 1. What does Alan like? A. Oranges. B. Pears. C. Apples. 2. Does his father like broccoli? A. Yes, he does. B. No, he doesn't. C. No, he likes onions. 3. What does the boy eat f...
【多选题】艾滋病病毒 HIV 的特点( )
A.
HIV 属于逆转 DNA 病毒,离开人体不易生存
C.
一般消毒剂如 70%酒精,1%戊二醛等均能使其消灭