在尚未冷却的沥青混合料面层上，()停放任何机械设备或车辆，不得散落矿料、油料等杂物。

如果7a=10b，那么a：b=______：______，a：10=______：______．

如图所示，质量m=6.0kg物块（可视为质点）从斜面上的A点由静止开始下滑，滑到斜面底端B后沿水平桌面再滑行一段距离后从C点飞出，最后落在水平面上的E点．已知物块与斜面、水平桌面间的动摩擦因数都为μ=0.50，斜坡的倾角θ=37°，CD高h=0.45m，BC长L=2.0m，DE长S=1.2m．假设斜坡与水平桌面间是平滑连接的，整个运动过程中空气阻力忽略不计．试求：

（1）物块经过C点的速度大小；

（2）物体在B点的速度大小；

（3）物体在斜面上滑行的时间．

U.S. first lady Michelle Obama arrived in Beijing on Thursday evening, the official Xinhua news agency said, beginning a hotly anticipated week-long trip during which she will promote education and cultural ties.

Obama, a Harvard-educated lawyer, is expected to spend Friday with China's charismatic first lady, Peng Liyuan, who is admired at home as both a glamorous songstress and fashion icon.

Besides Beijing, Obama will visit the western historic city of Xi'an and the southern city of Chengdu, where she will visit a panda preserve. Obama's two daughters are accompanying her, as well as her mother. She also plans to visit American and Chinese students to promote education and cultural exchanges, and visit historical landmarks like the Great Wall of China.

Foreign Ministry spokesman Hong Lei said the visit would help deepen ties between the world's two largest economies. "We believe that this visit will play an important role in increasing mutual understanding between the two countries and expanding friendship." Hong told reporters ahead of Obama's arrival.

News of Obama's arrival spread fast on Sina Weibo, where users speculated on what the trip would bring - as well as what Obama would wear and eat. "Two intellectual women playing the game of great power politics - how beautiful." wrote one user.

小题1:The underlined word “charismatic” in Paragraph 2 probably means _____.

A．smart

B．serious

C．charming

D．kindhearted小题2:From this passage we know that U.S. first lady Michelle Obama _____

A．is a Harvard-educated lawyer

B．will visit China alone

C．arrived in Beijing on Friday evening

D．will promote laws and cultural exchanges.小题3:According to the passage, which of the following is NOT true?

A．Michelle Obama will visit the western historic city of Xi'an and the southern city of Chengdu.

B．Sina Weibo users didn’t care about what the trip would bring.

C．Michelle Obama is expected to spend Friday with China's first lady, Peng Liyuan.

D．The U.S. first lady Michelle Obama will visit historical landmarks like the Great Wall of China.小题4:In which part of a magazine can we probably read this passage?

A．Entertainment.

B．Education.

C．Culture.

D．News.小题5:According to the Foreign Ministry spokesman，which of the following is NOT true？

A．The visit would help deepen ties between the world's two largest economies.

B．The visit will play an important role in increasing mutual understanding between the two countries.

C．The visit will promote education and cultural exchanges.

D．The visit will expand mutual friendship between the two countries.

为进行冷切焦水池的检修，需要将冷切焦水池内的水抽到（）。

A、含硫污水系统

B、含油污水系统

C、雨水系统

D、任意一个都可以

《中华人民共和国个人所得税法》属于税收程序法。( )