滑车组不能（）。A、省力 B、改变力的方向 C、起吊物体 D、减_爱下问搜题

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问题单项选择题

滑车组不能（）。

A、省力

B、改变力的方向

C、起吊物体

D、减少摩擦

答案

参考答案：D

完形填空

完形填空。

Dear Tony,
     How was your day    1     ? Did you have fun     2    ? I didn't have a very fun day.
I     3    my cousins. It rained     4    . In the morning, I stayed in the house and watched
videos, played computer games, and    5     .In the afternoon, Uncle Martin put some of
his old things out in the yard and had a yard     6     !    7    , it was    8    of boring.
    9    came to the sale    10    the weather was so bad.
     See you soon.
                                                                                                                Nick

( )1. A. of
(     )2. A. to camp
(     )3. A. visited
( )4. A. a day
( )5. A. readed
(     )6. A. house
( )7. A. Unfortunately
( )8. A. kinds
( )9. A. Someone
( )10. A. so

B. off
B. camps
B. to visit
B. all day
B. reading
B. room
B. Unfortunate
B. lot
B. Anyone
B. because

C. on
C. camping
C. visiting
C. all the day
C. to read
C. sale
C. Unfortunatly
C. kind
C. Everyone
C. as

D. in
D. camp
D. visit
D. all days
D. read
D. in sale
D. Fortunately
D. little
D. No one
D. that

问答题简答题

什么是设备润滑“五定”？