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【多选题】
右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 ,小轮的半径为 2r 。 b 点在小轮上,到小轮中心的距离为 r 。 c 点和 d 点分别位于小轮和大轮的边缘上。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b点的角速度大小相等
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
【多选题】癫痫部分运动性发作的特点是
A.
杰克逊发作
B.
局部的抽动
C.
Todd瘫痪
D.
语言有时中断
E.
病灶多位于中央沟以后
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A.
Warn young people of the hardships that a successful writer has to experience.
B.
Advice young people to give up their idea of becoming a professional writer.
C.
Show young people it's unrealistic for a writer to pursue wealth and fame.
D.
Encourage young people to pursue a writing career.
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A.
as
B.
of
C.
by
D.
in
【单选题】如果Peo类中有公用静态数据成员ag,则下列语句错误的是:
A.
cout<< /div>
B.
cout<< /div>
C.
Peo p1; cout<< /div>
D.
Peo p1; cout<< /div>
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A.
performed
B.
performing
C.
being performed
D.
to be performed
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