试题与答案

下列关于力和运动的说法正确的是 A.人推墙的力和墙对人的力是一对平衡力 B.静止

题型:选择题

题目:

下列关于力和运动的说法正确的是

A.人推墙的力和墙对人的力是一对平衡力

B.静止的物体不受摩擦力,运动的物体才受摩擦力

C.给正在运动的物体再施加一个力,物体就会比原来运动得更快

D.在平直轨道上匀速行驶的火车车厢里,竖直向上跳起的人仍将落回原处(不计空气阻力)

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D

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After shopping, you may get tired. You can walk into the sitting-room for a short rest. If you go into the dinning rooms in the malls, you can have a good meal. Now more and more Americans like to go shopping there.

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A.under one roof

B.on the ground floor

C.in the open air

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A.a big house

B.a place

C.a small shop

D.a room

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题型:选择题

2010年10月以来我国多座城市正在遭遇一场前所未有的“柴油荒”。“柴油荒”最主要原因是“突击式限电”。各地面临节能减排“大考”,部分地区为完成节能降耗指标开始实施大面积拉闸限电。企业不惜重金购买柴油发电机保障机器运转,节了电却费了油。这是因为

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A.①③

B.②④

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