闭环系统比开环系统及半闭环系统_____。 A．稳定性好 B．故障_爱下问搜题

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问题单项选择题

闭环系统比开环系统及半闭环系统_____。

A．稳定性好

B．故障率低

C．精度低

D．精度高

答案

参考答案：D

完形填空

完形填空。

     My   1    is Mary. I 2   eleven. Ted is my friend.    3   is thirteen. We   4    in the same school.
My   5   is a teacher. She is a teacher in   6    school. My dad (爸爸) is a teacher,   7   . He is an
   8    teacher in a college(大学). I have a cat(猫). Its (它的) name is Mimi. It   9    white and black.
It’s a nice cat. We are good   10  .

( )1. A. sister
( )2. A. /
( )3. A. I
( )4. A. be
( )5. A. dad
( )6. A. my
( )7. A. also
( )8. A. tall
( )9. A. am
( )10.A. friend

B. friend
B. is
B. We
B. is
B. mom
B. us
B. too
B. short
B. is
B. friends

C. book
C. are
C. He
C. are
C. teacher
C. mine
C. and
C. strong
C. has
C. friend's

D. name
D. am
D. She
D. am
D. shirt
D. hers
D. but
D. English
D. are
D. friends'

单项选择题

属于主承托区

A．牙槽嵴
B．磨牙后垫
C．切牙乳突
D．颊侧前庭
E．黏膜腺导管开口