如图在水平放置的书架上,如图所示,并排立放着10本同样的书,如果取走5本,则桌面

题型:选择题

问题:

如图在水平放置的书架上,如图所示,并排立放着10本同样的书,如果取走5本,则桌面受到的(  )

A.压力和压强都减小一半

B.压力减小一半,压强不变

C.压力减小一半,压强增大一倍

D.压力不变,压强增大一倍

考点:压强的大小及其计算
题型:选择题

从事招标代理业务并提供相关服务的社会中介组织是( )。

A.招标代理机构

B.招标代理组织

C.招标方案

D.招标投标机构

题型:选择题

男,58岁。上前牙反复肿痛4年,要求诊治。年轻时左上前牙有洞曾在医院治过。检查见大面积黄白色充填物边缘发黑,叩痛(±);牙尖部折断牙冠变色,叩痛(-),间唇侧龈近根尖部有瘘管口。

提示:根管治疗完成,根管充填的质量满意。为了观察确切的疗效,最早复查的时间应为()

A.3周

B.6个月

C.12个月

D.24个月

E.36个月

题型:选择题

根据以下资料,回答以下各题。

医疗机构诊疗和入院情况统计表

年份诊疗人次(亿次)入院人数(万人)
合计医院卫生院合计医院卫生院
198025.5310.5322472247
198524.1113.1111.00433125601771
199025.5914.9410.65514031821958
199126.1415.3210.82529232762016
199225.6915.3510.34522232621960
199322.0513.078.98492130661855
199422.4212.699.73499230791913
199521.9012.529.38503330731960
199622.3912.819.58502331001923
199721.5712.279.30504431211923
199821.2512.398.86499532381759
199920.82121318.51507333791694
200021.2312.868.37529735841713
200120.8712.508.37546437591705
200221.4512.437.30599139971654
200320.9612.137.10609241591626
200422.0313.057.03667646731621
200523.0513.876.99718451081641

表中所列年份中卫生院接受诊疗人次最大值与最小值的差额是( )。

A.3.54亿

B.4.01亿次

C.2.09亿次

D.2.08亿次

题型:选择题

E


Last year, Shanghai-born Charles K. Kao and two North American scientists got the 2009 Nobel Prize(诺贝尔奖) in Physics together. Their work made the Internet come into a new age.
Kao, 77, was born in Shanghai in 1933. He is famous for finding out how to transmit (传输)light signals(信号) over long ways through glass fibers (玻璃纤维) as thin as a human hair. His work makes the Internet information transmit faster around the world. Kao was vice chancellor(副校长) of the Chinese University of Hong Kong from 1987 to 1996. He doesn’t work, and lives in Hong Kong now.
The Chinese people were pleased to learn the good news. "The people of Hong Kong and I send our congratulations to Kao on receiving the prize... Kao is also a true gentleman. We are greatly proud to have such an excellent person in Hong Kong. "Zeng Yinquan once said.
Willard Boyle, a Canadian American, and George Smith of the United States got the other half of the prize.

How many scientists got the 2009 Nobel Prize in Physics together ( )

A.One.

B.Two.

C.Three.

D.Four

题型:选择题

有关乳酸循环的描述,错误的是()

A.可防止乳酸在体内堆积

B.最终从尿中排出乳酸

C.使肌肉中的乳酸进入肝脏异生成葡萄糖

D.可防止酸中毒

E.使能源物质避免损失

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