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【单选题】
世界上公认的第一台电子计算机诞生的年代是.A.
1943
B.
1946
C.
1950
D.
1951
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【简答题】在图所示平面系统中，已知：匀质圆盘A和匀质圆环B均重P，半径均为R，两者用杆AB相连，若均沿倾角为φ的斜面作纯滚动，略去杆AB重量，试求： (1)杆AB的加速度；(2)杆AB的内力；(3)轮A受到的摩擦力。
【多选题】blue / remembered the /she / at her grandmother’s home / small / statue .
A.
blue
B.
remembered the
C.
she
D.
at her grandmother’s home
E.
small
F.
statue
【单选题】-----Hello, come in． ． -----Thank you．
A.
All right
B.
Make yourself at home
C.
That’s my home
D.
It’s a great honor
【单选题】—_______? —She's staying at home. [ ]
A.
Where is she
B.
What is she doing this weekend
C.
Where are you going
D.
How long is Lily staying at home
【单选题】---She’s seldom asked to do housework at home, she? --- . Her parents are very busy with their work, so she has to do the laundry every day.
A.
has; Yes
B.
hasn’t; No
C.
is; Yes
D.
isn’t; No
【简答题】在图示的平面系统中,匀质球A重为P,借本身重量和摩擦不计的理想滑轮C 和柔绳维持在仰角是α的光滑斜面上,绳的一端挂着重为Q 的物体B。试分析物体B、球A 和滑轮C 的受力情况,并分别画出平衡时各物体的受力图。
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