搜题请搜索小程序“爱下问搜题”
问题 选择题

如图所示，在竖直平面内固定着半径为R光滑的圆孤槽，它的末端水平，上端离地面高H，一个小球从上端无初速滑下，则小球落地时离出发点的水平距离为                       （   ）

A．

B．

C．

D．

答案

答案：D

单项选择题 共用题干题

妊娠后母体血清HCG浓度呈对数上升，确定妊娠最重要的标志是定量检测血液或尿液中HCG含量。异位妊娠HCG值低于同期正常妊娠值，血HCG测定可用于诊断异位妊娠或异常宫内妊娠。异位妊娠时HCG浓度变化很大，可从0到200000U/L不等。

最常用的妊娠试验是 （）

A.血凝抑制试验

B.尿液HCG定性试条

C.尿液HCG生物定性法

D.乳胶凝集抑制试验

E.血HCG测定
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改错题

短文改错。
     此题要求改正所给短文中的错误,对标有题号的每一行作出判断：如无错误,在该行右边横线上
画一个勾（Ⅴ）；如果有错误（每行只有一个错误）,则按下列情况改正：
     此行多一个词：把多余的词用斜线（﹨）划掉,在该行右边横线上写出该词,并也用斜线划掉。
     此行缺一个词:在缺词处加一个漏字符号（∧）,在该行右边横线上写出该加的词。
     此行错一个词：在错的词下划一横线,在该行右边横线上写出改正后的词。
     注意：原行没有错的不要改。

     For the final speaker here today, I would like to
share you some of the conclusions of our research.We
wanted to know that the Internet would become the most
popular source of news for people.They have found that
although the Internet has become increasing popular, 
the number of people which get news from the Internet
compares to the radio or television is still small.While
the Internet is the popular tool, it is still not as easily accessible
as newspapers, television and the radio is, and due to
the amount of uncontrolled information on the Internet,
people do not always trust the news they find it online.

1._____
2._____
3._____
4._____
5._____
6._____
7.______
8._____
9._____

10._____
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