一辆车由静止开始作匀变速直线运动,在第8s末开始刹车,经4s停下来,汽车刹车过程

题型:选择题

问题:

一辆车由静止开始作匀变速直线运动,在第8s末开始刹车,经4s停下来,汽车刹车过程也是匀变速直线运动,那么前后两段加速度的大小之比a1:a2和位移之比x1׃x2分别是(  )

A.a1:a2=1:4,x1׃x2=1:4

B.a1:a2=4:1,x1׃x2=2:1

C.a1:a2=1:2,x1׃x2=2:1

D.a1:a2=1:2,x1׃x2=1:4

考点:匀变速直线运动的位移与时间的关系
题型:选择题

---I think students should have mobile phones to call their parents.

---___________. They often use them to play games instead.

A.I hope so

B.I don’t agree

C.No problem

D.Good idea.

题型:选择题

(2013·安徽高考)David is ________ animal fur, so he won't visit anyone who has cats or dogs in the house.

A.curious about

B.allergic to

C.satisfied with

D.fond of

题型:选择题

完成句子   按所给的汉语,用英语完成下列句子。 (本大题共10分,1-5小题每空一词,每空0.5分;第6小题完成句子,1.5分)

小题1:我的外套和她的外套尺寸一样,但是颜色不同。

My coat is                                    hers, but it is a different colour.

小题2:教练叫他们继续训练。

The coach told them to                            the training.

小题3:这场雨对比赛没多大影响。

The rain didn’t                                    the game.

小题4:活动的目的就是警告我们不要独自一人去游泳。

The purpose of the activity is                  us          to swim alone.

小题5:在商场,我们买了几个钥匙圈给同班同学。

We bought                            key rings for classmates in the shopping mall.

小题6:他爷爷与别人交流有困难。

His grandfather                                 with others.

题型:选择题

适用于平衡能力稍欠佳、臂力较弱或上肢患有震颤麻痹、使用三足手杖不安全的患者的为()

A.四足手杖

B.肘杖

C.单足手杖

D.腋杖

E.以上均不正确

题型:选择题

某B股最后交易日的收盘价为0.800美元/股,每股红利为0.005美元,股权登记日收盘价为0.799美元/股,则该股除息报价为( )美元/股。

A.0.895
B.0.89
C.0.795
D.0.79

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