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【多选题】
图中所示为一皮带传动装置,右轮的半径为 r , a 是它边缘上的一点。左侧是一轮轴,大轮的半径为 4r ,的半径为 2r 。 b 点在上,到中心的距离为 r 。 c 点和 d 点分别位于和大轮的边缘上。若在传动过程中,皮带不打滑。则 ( )A.
a点与d点的向心加速度大小相等
B.
a点与d点的向心加速度大小相等
C.
a点与c点的线速度大小相等
D.
a点与b点的线速度大小相等
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举一反三
【单选题】Somebody has to keep a vigilant eye on a reality that huge, especially when it is a reality that decides this University's present and future.
A.
vigorous
B.
secret
C.
sharp
D.
busy
【单选题】三棱台 ABC-A 1 B 1 C 1 中, AB ∶ A1B1 =1∶2,则三棱锥 A 1 ABC , B - A 1 B 1 C, C-A 1 B 1 C 1 的体积之比为( )
A.
1∶1∶1
B.
1∶1∶2
C.
1∶2∶4
D.
1∶4∶4
【单选题】_______we are concerned , this China Culture Tour is very exercising and a huge success.
A.
As soon as
B.
As far as
C.
As though
D.
Now that
【单选题】-I have got into the __________ of turning on the TV as soon as I get home. -I think it's not good and you should do your homework first. [ ]
A.
hobby
B.
habit
C.
interest
D.
walk
【简答题】n. 商店,贮藏; vt. 储存,贮藏
【单选题】This is a huge and difficult project and if you take it up, you ________ many difficulties.
A.
like to encounter
B.
like encountering
C.
are likely to encounter
D.
are like to encounter
【简答题】什么叫安时特性
【单选题】This is a huge and difficult project and if you take it up, you ________ many difficulties.
A.
like to encounter
B.
like to encountering
C.
are likely to encounter
D.
are like to encounter
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