甲、乙两个物体沿同一直线向同—方向运动时,取物体的初速度方向为正方向,甲的加速度

题型:选择题

问题:

甲、乙两个物体沿同一直线向同—方向运动时,取物体的初速度方向为正方向,甲的加速度恒为2 m/s2,乙的加速度恒为-3 m/s2,则下列说法正确的是( )

A.两物体都做匀加速直线运动,乙的速度变化快

B.甲做匀加速直线运动,它的速度变化快

C.乙做匀减速直线运动,它的速度变化率大

D.甲的加速度比乙的加速度大

考点:机械运动
题型:选择题

A big umbrella

Nancy: I saw seven girls in one umbrella and none of them got wet.

Taney: Oh, that must be a very big umbrella.

Nancy: No, it wasn’t raining. [

A good boy

Little Robert asked his mother for two cents(美分).

“What did you do with the money I gave you yesterday?”

“I gave it to a poor old woman,” he answered.

“You’re a good boy,” said the mother proudly. “Here are two more cents. But why are you so interested in the old woman?”

“She is the one who sells candies. ”

Break a mirror

“What are you so happy about, Jason?” Lisa asked the 98-year-old man.

“I broke a mirror,” he replied.

“But that means seven years of bad luck. ”

“I know,” he said happily. “Isn’t it wonderful? I can live for another seven years. ”

小题1:The three passages above are all ________.

A.jokes

B.notices

C.news

D.letters小题2:The seven girls didn’t get wet because _________.

A.the umbrella was big enough

B.the seven girls wore raincoats

C.it wasn’t raining at all

D.it wasn’t a heavy rain小题3:Little Robert spent the money ________.

A.helping the poor old lady

B.buying candies for himself

C.helping his mom

D.buying gifts for his mom小题4:_________ broke the mirror.

A.Nancy

B.Lisa

C.Robert

D.Jason

题型:选择题

2005年3月14日第十届全国人民代表大会第三次会议通过《反分裂国家法》,制定该法是为了 [     ]

①反对和遏制“台独”分裂势力分裂国家

②促进祖国和平统一

③维护台湾海峡地区和平稳定

④使用武力解决台湾问题

⑤维护国家主权和领土完整

A.①②③⑤

B.②③④⑤

C.①②④⑤

D.①②③④

题型:选择题

急诊抢救室空气消毒后监测标准值为()。

A.细菌,总数≤5cfu/cm2

B.细菌,总数≤10cfu/cm2

C.细菌总数≤15Cfu/cm3

D.细菌,总数≤200cfu/m3

E.细菌总数≤500cfu/m3

题型:选择题

商业银行会计资本的数量应该不小于经济资本的数量。会计资本是商业银行可以利用的资本,风险带来的任何损失都会反映在账面资本上,两者之间的媒介是经济资本。( )

题型:选择题

离心泵主要由泵壳、()、()、托架及副叶轮等构成。

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