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阅读理解。 A seventeen-year-old boy from the northeastern state of Massachusetts has won the top prize in the Intel Science Talent Search. The competition is the oldest program in the United States that honors the science projects of high school students. The Intel Science Talent Search is 63 years old this year. The winners receive a new computer and money for a college education. This year 1 652 students from 46 states entered projects for the competition. Their research involved nearly every area of science, including chemistry, medicine, physics, mathematics, engineering, computer science and social science. Forty students were invited to Washington, D. C. for the final judging. A group of well-known scientists judged them on their research abilities, critical thinking skills and creativity. The judges also questioned the students about scientific problems before deciding on the winners. The top winner is Herbert Mason Hedberg of North Attleboro, Massachusetts. The second place winner is Boris Alexeev of Athens, Georgia and the third place winner is Ryna Karnik of Aloha, Oregon. Herbert received 100 000 dollars for his college education. He developed a faster, more effective method to tell if a person has cancer. He explored a way to separate telomerase, an enzyme (酶) found in most cancer cells. His findings have helped advance research into ways of stopping cancer cells from growing. Herbert said he started the project after watching his grandmother struggle against cancer. He plans to be a doctor and continue doing, medical research. Andrew Yeager of the University of Pittsburgh Medical Center was chairman of the judges for the Intel Science Talent Search this year. He said the competition was an excellent way to discover future leaders in science and technology. Past competition winners have gone on to receive many of the world's highest honors for science and mathematics. 1. Herbert's way is more effective because _____. A. it can kill cancer cells faster B. it helps to free humans from cancer C. it can stop cancer cells from growing D. it can tell faster if a person is a cancer sufferer 2. We can learn from the passage that _____. A. the final judging of the competition took place in the state of Massachusetts B. less than three percent of the competitors entered the final part of the competition C. critical thinking and creativity are more important than research abilities D. the scientists judging this year's competition all work for Intel Corporation 3. What would be the best title for the passage? A. Intel Science Talent Search B. How to Discover Future Scientists C. Intel Science Talent Search Winners D. A Very Famous Competition
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【单选题】通入水中所得溶液呈碱性的气体是
A.
NH 3
B.
NO 2
C.
SO 2
D.
HCl
【单选题】下列气体通入水中,所得溶液呈碱性的是
A.
Cl 2
B.
NO 2
C.
CO 2
D.
NH 3
【多选题】集装箱的船舱口占船体宽的
A.
60%
B.
70%
C.
80%
D.
90%
【简答题】已知Na 2 CO 3 的水溶液呈碱性.在一烧杯中盛有31.4g Na 2 CO 3 和NaCl组成的固体混合物,向其中逐渐滴加溶质质量分数为10%的稀盐酸,放出气体的总质量与所滴入稀盐酸的质量关系曲线如下图所示,请根据题意回答问题: (1)当滴加稀盐酸至图中B点时,烧杯中溶液的pH______7(填>、=或<); (2)通过计算求出烧杯中溶液恰好是中性时,所得溶液中溶质的质量分数.
【单选题】患者,男,70岁,因头痛、头昏来院就诊,既往有高血压史10年。如果患者取坐位,测量血压时肱动脉应平()
A.
腋中线
B.
第四肋软骨
C.
第三肋软骨
D.
腋前线
E.
腋后线
【单选题】患者男,70岁。因头痛、头昏来院就诊,既往有高血压史10年。如果患者取坐位,测量血压时肱动脉应平
A.
腋中线
B.
第4肋软骨
C.
第3肋软骨
D.
腋前线
E.
腋后线
【单选题】患者男,70岁。因头痛、头昏来院就诊,既往有高血压史10年。住院期间,护士应定期监测患者血压,以下操作错误的是
A.
患者取坐位或卧位
B.
袖带松紧以能放入一指为宜
C.
测量时使血压计的“0”点与心脏、肱动脉在同一水平线上
D.
听诊器胸件应塞在袖带内,以便于固定
E.
以每秒4mmHg(0.5kPa)速度放气
【简答题】已知 Na 2 CO 3 的水溶液呈碱性。在一烧杯中盛有31.4g Na 2 CO 3 和NaCl 组成的固体混合物,向其中逐渐滴加溶质质量分数为10%的稀盐酸,放出气体的总质量与所滴入稀盐酸的质量关系曲线如下图所示,请根据题意回答问题: (1)当滴加稀盐酸至图中B点时,烧杯中溶液的pH 7(填>、=或<); (2)通过计算求出烧杯中溶液恰好是中性时,所得溶液中溶质的质量分数。
【单选题】下列有关土体室内固结压缩试验的论述错误的是( )。
A.
土样放在刚性金属环刀及刚性护环内,使得土样在竖向压力使用下,只能产生竖向变形
B.
在土样上下放置透水石的作用是使土体孔隙中的水能有效排出
C.
施加压力一般为6级
D.
土样产生的压缩量通过百分表量测
【单选题】下列有关土的压缩性的论述中,错误的是( )。
A.
超固结土的压缩变形量最大
B.
根据土的回弹——再压缩曲线,可知土是弹塑性体
C.
固结度越大,土完成的沉降变形值就越大
D.
压缩系数越小,土的变形越小
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