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【简答题】
质点在力F的作用下,由位置r a 运动到位置r b ,经过的路程为s,如图所示。如果力F的关系分别为F1=kr 0 (r 0 为矢径方向的单位矢量),F 2 =kv 0 (v 0 为速度方向的单位矢量)。试求两种力F 1 和F 2 在该过程中所做的功。
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举一反三
【单选题】不是RECTAN G命令的选项是().
A.
标高(E)
B.
边(E)
C.
厚度(T)
D.
宽度(W)
【多选题】软件绘制时,板负筋分类有哪些?
A.
跨梁负筋
B.
跨板负筋
C.
支座负筋
D.
板受力筋
【单选题】(南京学情)Do you sometimes ignore loved ones because your life is too fast and busy leaving them ___whether you really love them?
A.
wonder
B.
to be wondering
C.
wondering
D.
wondered
【单选题】( )穴有润肤养颜、止咳平喘的作用。
A.
肝俞
B.
肺俞
C.
心俞
D.
膈俞
【简答题】求下列各圆柱的表面积。 (1)底面周长是62.8米,高是5米。 (2)底面半径是5厘米,高4厘米。
【单选题】There are actually too many opportunities to learn more, to see more, and to understand more, and they all require us to change, at least a little bit, in order to make progress.
A.
very many
B.
too much
C.
so many
D.
extremely many
【简答题】2底面半径 2 厘米,高 5 厘米
【单选题】_______ the two, Maiy is _______ dancer.
A.
Of, the more gifted
B.
Of, more gifted
C.
In, the more gifted
D.
In, more gifted
【简答题】一个圆柱的表面积是188.4厘米 2 ,底面半径是5厘米,它的高是多少厘米?
【单选题】(南京学情) Adapted versions of foreign shows have gained massive audiences, thus ___ more Chinese television groups to buy foreign materials.
A.
to inspire
B.
inspiring
C.
inspired
D.
having inspired
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