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问题 选择题

明明用水平推力推静止在地面上的桌子，但没有推动，此时（　　）

A．水平推力小于桌子的重力

B．水平推力小于桌子受到的摩擦力

C．水平推力等于桌子的重力

D．水平推力等于桌子受到的摩擦力

答案

桌子在水平方向上受推力F与摩擦力f作用而静止，桌子处于平衡状态，所受合力为零，则F=f；

推力F与桌子的重力G无关．

故选D．

单项选择题

Expressing gratitude is an important form of good manners. Nowadays more and more people in China have found it’s high time to (1) a thankful heart for the young.Everyone likes to get praised and appreciated. Gratitude is the greatest of virtues, which lets others smile and makes the world more beautiful. You just need several minutes to write down a thank-you note, but it brings much joy to the (2) .We live in a society where we enjoy the different services of others. But (3) of them should be taken for granted.Gratitude is also a kind of (4) in life. In developing gratitude for every moment—for the simple joys and even for the (5) times—we come to truly enjoy and appreciate life. Then we are able to see the (6) that surrounds us.Try to write a thank-you letter to your parents for working hard to (7) you a happy life.Be grateful to your teachers because of their (8) with your studies and character building.Say thanks to your friends who (9) both your happiness and sorrow. We are sure it will bring them much joy and add (10) into your own life as well.

第（10）空应选择（）

A．reflection

B．justice

C．taste

D．color
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多项选择题

男女西裤裤片归烫部位包括（）。

A.前裤片上裆侧缝

B.前裤片前中线

C.后裤片上裆侧缝

D.大裆斜中线

E.后片下裆部位
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