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【单选题】
四个伟大中,()是目标,指引前进方向。A.
伟大斗争
B.
伟大梦想
C.
伟大工程
D.
伟大事业
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反馈参考答案：
举一反三
【单选题】如图 2所示,质量 m = 10 kg的物体,在水平地面上向左运动,物体与水平地面间的动摩擦因数 μ = 0.2,与此同时,物体受到一个水平向右的推力 F = 20 N的作用,则物体的加速度为(取 g = 10 m/s 2 )
A.
0
B.
4 m/s 2 ，水平向右
C.
2 m/s 2 ，水平向右
D.
2 m/s 2 ，水平向左
【简答题】完形填空。 Last summer, I was a volunteer (志愿者) at a shelter for the homeless, a place for homeless people to sleep at night. I wasn't working that summer and was taking only two classes in summer school, ...
【简答题】如何实现两个客户端通信?试编程加以说明。
【单选题】This earthquake _______ several cities in the vicinity, resulting in hundreds of people homeles s.
A.
affected
B.
effected
C.
influenced
D.
impressed
【单选题】The Wenchuan earthquake in 2008 is believed _____ more than 70,000 people and made thousands homeless, _____ it perhaps the most destroying earthquake in history. [ ]
A.
to kill; making
B.
to have killed; making
C.
having killed; to make
D.
killing; made
【单选题】一个物体放在水平地面上,下列关于物体和地面受力情况的叙述正确的是( )
A.
地面受到向下的弹力是因为地面发生了形变
B.
地面受到向下的弹力是因为物体发生了形变
C.
物体受到向上的弹力是因为物体发生了形变
D.
物体受到地面向上的支持力不属于弹力
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