试选用“>”或“<”或“=”填空. (1)50g水和50g酒精混合后的总质量__

题型:填空题

问题:

试选用“>”或“<”或“=”填空.

(1)50g水和50g酒精混合后的总质量______100g;

(2)碳原子中核内质子数______核外电子数;

(3)钠的金属活动性______铝的金属活动性

(4)同一条件下,50ml氮气和50ml氧气混合以后的体积______100ml;

(5)将5g碳酸钠粉末加到95g溶质质量分数为10%的盐酸中,充分混合后溶液的质量______100g.

考点:质量守恒定律原子结构相对原子质量原子的定义构成物质的微粒(分子、原子、离子)
题型:填空题

躯体性疼痛特点

A.痛感弥漫

B.定位准确

C.敏感、反应迅速

D.可引起局限性的腹肌紧张

E.疼痛尖锐

题型:填空题

晚婚、晚育有利于控制人口过快增长。                (      )

题型:填空题

关于血管紧张素转化酶抑制剂治疗高血压的特点,下列哪种说法是错误的()

A.用于各型高血压,不伴有反射性心率加快

B.防止和逆转血管壁增厚和心肌肥厚

C.降低糖尿病、肾病等患者肾小球损伤的可能性

D.降低血钾

E.久用不易引起脂质代谢障碍

题型:填空题

The public commonly associates steroid use with big-time athletics. But the drugs may be even more of a menace to teenagers. The synthetic hormones can stunt a young person’s growth by prematurely closing the ends of the long bones in the skeleton. That means a 1.7 metre, 15-year-old high school student who uses steroids “might get bigger but won’t get any taller”, according to a US doctor.

Nearly seven percent of boys in the US try steroids before the end of high school, according to a 1988 study by professors Charles Yesalis and William Buckley, of Penn State University. The estimate comes from a poll of 3,400 seniors in 46 public and private schools across the US.

“Abusers of Steroids did it to improve their appearance and to excel at sports,” Professor Yesalis said. “Parents, teachers and coaches make boys believe that to be an ideal male you need to have these. Then they say: ‘you can’t play games to have fun; you play games to win.’”

“Such attitudes put many high school athletes at high risk of becoming abusers of steroids,” said Mike Gimbel, director of Baltimore County Office of substance Abuse. “For these athletes, the pressure to perform is incredible,” he said. “It was inevitable that it would seep down to high school level.”

小题1:The word “big-time” in Paragraph 1 most nearly means “________”.

A.long time

B.good time

C.top rank

D.modern小题2:Why are steroids even more of a threat to teenagers?

A.Because they make teenagers grow too tall.

B.Because they make teenagers get too big.

C.Because they prevent teenagers from getting taller and taller.

D.Because they give teenagers too much pressure.小题3:Which of the following statements is implied but not mentioned?

A.School athletes have too much pressure.

B.Steroids can help people have lots of muscles.

C.The pressure chiefly comes from parents, teachers and coaches.

D.Girls are not interested in steroids.小题4:Which of the following is a good title for this passage?

A.Drugs and Sports

B.The Pressure to School Boys are Too Much

C.School Boys are Interested in Drugs

D.School Athletes Risk Damage from Drugs

题型:填空题

会计与统计相结合的核算方法的特点。

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