两个工程队，甲队人数比乙队人数的45少30人，若从乙队调10人到甲队，则甲队人数

宇宙空间资源的特点是 [ ]

A、空气薄、强辐射、失重

B、高真空、弱辐射、失重

C、高密度、强辐射、失重

D、高真空、强辐射、失重

如图甲所示，电压表V1、V2串联接入电路中时，示数分别为6V和4V，当只有电压表V2接入电路中时，如图乙所示，示数为9V，电源的电动势为

A. 9.8V        B.10V      C.10.8V       D.11.2V

⑵(12分)在验证“机械能守恒定律”的实验中，一同学进行如下操作；

①将打点计时器水平固定在铁架台上

②将长约0.5m的纸带用小夹子固定在重物上后穿过打点计时器。用手提着纸带，使重物静止在靠近打点计时器的地方

③先松开纸带，后接通电源，让重物自由下落，打点计时器就在纸带上打下一系列的点

④换几条纸带，重做上面的实验

⑤在打出的纸带中挑选第一、二两点间距接近2mm，且点迹清楚的纸带进行测量，先记下O点的位置，依次再取四个计数点A、B、C、D。求出相应位置对应的速度及其下落的高度

⑥将测量数据及计算结果填入自己设计的表格中

⑦根据以上测得的数据计算相应的和的值。验证机械能守恒定律

Ⅰ.以上操作有错误的是_________________________;

Ⅱ.实验中选出一条纸带如图所示，其中O点为起始点，A、B、C、D为四个计数点，打点计时器所选用电源是频率为50的交流电，用最小刻度为1mm的刻度尺，测得OA=11.13m,OB=17.69m,OC=25.9m.这三个数据中不符合有效数据要求的是___,在计数点A和B之间，B和C之间各还有一个点，重锤的质量为，根据以上数据，当打点到B点时重锤的重力势能比开始下落时减少了___，这时它的动能是__.()

Ⅲ.实验中往往出现重锤的重力势能减少量大于动能的增加量，其主要原因是______

抑制甲状腺素的释放（）

A.TSH（促甲状腺激素）

B.碘剂

C.硫脲类衍生物

D.放射性¹³¹I

E.过氯酸钾

Recently, South Korean star PSY’s ‘Gangnam style” video has been popular on the Internet. It has become most people’s favorite music.

In fact, the song has set the Guinness World Record for the most popular video in the history of the Internet. More than two million people have said “like” since the song was on the Internet on July 15.

PSY”s special dance moves and funny horse riding style have attracted many people. Although many people do not understand the language, the video has become the talk of the Internet. The song has come to first place in the music charts(排行榜) in 31 countries, including the United States, the United Kingdom, and Canada.

“I just sang for my South Korean fans. I have never expected it to be popular in other countries,” PSY told the reporters on a concert. The song was so popular that a few of South Korean’s politicians showed PSY’s moves to attract supporters.

“The song came out in mid-July. It sings about the rich life of South Korea —especially Gangnam in Soeoul, where a lot of rich people live.

Millions of people have watched the video. Many stars, such as Katy Perry, Robbie Williams and Nelly Furtado said that they love the song. These stars performed part of the song at a recent concert.

Riding high on the success of “Gangnam Style”, PSY was signed by Scooter Braun to Braun’s Schoolboy Records, a label distributed by Universal Republic.

PSY has written many hit songs of varying styles for different singers. Prior to “Gangnam Style” his most famous composition perhaps was Lee Seung Gi’s debut(首次亮相) song “Because You Are My Woman”.

小题1:What makes PSY’s “Gangnam Style” the famous music of millions of people?

A．The song has set the Guinness World Record.

B．The song has come to first place in the music chart.

C．They like the dance moves and the horse riding style.

D．They don’t understand the words of the song.小题2:Why did some of South Korea’s politicians show PSY”s moves?

A．They wanted to tell people that they were also fond of music.

B．They wanted people to support them.

C．They were PSY’s fans.

D．They liked PSY’s dancing style.小题3:What’s “Gangnam Style” about?

A．The way of horse riding.

B．The rich life of people of Gangnam in Seoul.

C．The Guinness World Record.

D．The love of stars.小题4:What is the best title of the passage?

A．Life of the Music Star PSY

B．“Gangnam Styly” —— Most people’s favorite Music

C．PSY’s Famous Compositions

D．Meaning of “Gangnam Style”

男性，20岁，主诉发热乏力1个月，间断鼻出血。查体温38.9℃，皮肤有散在出血点，浅表淋巴结多处肿大如黄豆、蚕豆，胸骨中下段明显压痛，心肺无明显异常。肝脾肋下触及边。无外伤和传染病史。

该患者血常规为血红蛋白60g/L，白细胞8.8×10⁹/L，血小板45×10⁹/L。为明确诊断，下列哪项检查最有意义（）

A.白细胞分类

B.卡介苗试验

C.骨髓穿刺细胞学检查

D.肥达反应

E.血小板抗体测定