机械振动是指机器或结构物（）作往复性的运动。A．在其静平衡位置附近 B．在远离其平衡

如图所示，带有光滑弧形轨道的小车质量为m，放在光滑水平面上，一质量也是m的铁块，以速度v沿轨道水平端向上滑去，至某一高度后再向下返回，则当铁块回到右端时，将

A．以速度v做平抛运动

B．以小于v的速度做平抛运动

C．静止于车上

D．自由下落

邮包运输保险的险别有()和邮包一切险。

A.邮包基本险

B.邮包附加险

C.邮包险

D.邮包综合险

应对广大社会成员进行治安形势和违法犯罪发展趋势的教育，提高其( )。

A．公民基本道德意识

B．社会公德意识和法治意识

C．社会主义精神文明素质

D．治安防范意识

阅读理解。

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1. How long does it take the battery to charge up an iPhone?

A. 15 minutes.

B. 30 minutes.

C. 1.5 hours.

D. 3 hours.

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易中天因讲《品三国》而被戏称为“学术超男”，不过他不认同。他说：“其实我讲的是萝卜史学，所谓萝卜：一是草根的；二是很健康的，有益身体的；三是它可以生吃，素吃，荤吃，老少咸宜。”这留给我们的思考是（）

A.要发展传统文化

B.要发展经典文化

C.要发展大众文化

D.要发展萝卜史学