三相异步电动机按转子结构形式包括（）。A、绕组形 B、开启式 _爱下问搜题

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问题单项选择题

三相异步电动机按转子结构形式包括（）。

A、绕组形

B、开启式

C、封闭式

D、防护式

答案

参考答案：A

完形填空

完形填空。

     Catherine was a famous writer of children's stories. She lived in a fine old house in a small town near
London. Often she worked at home, in her quiet     l         long before her books became popular, she had tried to teach    2    how to use a computer.  But sometimes she had to     3      to get some books from the
library or have a meeting. She didn't like being away because she was worried about robbers. So she was very careful. Just before leaving, she always put a full cup of coffee on the writing desk, and left the radio playing to make a robber think someone   4   at home.
     One day she came back after a day out , and found that there was something different in her house.
There was only a little   5   left in the cup, and the radio was off. But when she looked at her computer, she saw it was   6   , and someone had typed in a new story. She had no idea who had got in, or how, because none of the doors or windows was broken. Then she sat down to read the story. To her surprise, it was a very good one. “I’ll use it in my   7   book”, she said     8   .
     The next month she had to go to London. She put a cup of coffee and a plate of sandwiches on the
desk. When she returned, the coffee and the sandwiches had      9      . She ran to the computer. This time
there was only     10   0n the screen.  “IT’S NOT YOUR STORY . IT’S MINE ! ”it said.

( ) 1. A. classes
( ) 2. A. the students
( ) 3. A. leave the house
( ) 4. A. must have
( ) 5. A. water
( ) 6. A. on
( ) 7. A. old
( ) 8. A. carefully
( ) 9. A. brought
( ) 10.A. a piece of paper

B. lessons
B. herself
B. have a rest
B. has
B. milk
B. off
B. first
B. sadly
B. broken
B. a message

C. classroom
C. the robber
C. give a message
C. must
C. coffee
C. broken
C. every
C. happily
C. gone
C. a new story

D. study
D. her children
D. buy a computer
D. must be
D. tea
D. over
D. next
D. badly
D. eaten
D. a letter

句型转换

句型转换(每小题1分，共5分)

小题1:Lucy’s pen is better than Kate’s.(改为同义句)

Kate’s pen is Lucy’s.

小题2:Betty has to take the medicine three times a day.(对画线部分提问)

______ ______ dose Betty take the medicine?

小题3:My mother goes to work by bike.(对画线部分提问)

Your mother to work?

小题4:The twins often visit their uncle on weekends.(用next weekend改写句子)

The twins ___ their uncle next weekend.

小题5:He started learning English when he was five years old.(改写句子)

He started learning English ________ ___________ ________ _______.