蹦极运动员从高处跳下,弹性绳被拉展前做自由落体运动,被拉展后在弹性绳的缓冲作用下,下

题型:单项选择题

问题:

蹦极运动员从高处跳下,弹性绳被拉展前做自由落体运动,被拉展后在弹性绳的缓冲作用下,下落到一定高度后速度减为零。下列说法中正确的是()。

A.弹性绳拉展前运动员处于失重状态,弹性绳拉展后运动员处于超重状态

B.弹性绳拉展后运动员先处于失重状态,后处于超重状态

C.弹性绳拉展后运动员先处于超重状态,后处于失重状态

D.运动员一直处于失重状态

考点:百科知识竞赛百科知识竞赛题库
题型:单项选择题

阅读下面一篇文章,从每小题所给出的A、B、C、D中找出第二至第五段各段的最恰当的大意。

    I know what you're thinking: pizza (比萨饼)? For breakfast? But the truth is that you can have last

night's leftovers in the a.m. if you want to.

    I know lots of women who skip breakfast (不吃早餐), and they have a ton of different excuses for

doing it. Some say they don't have time, others think they're "saving" calories (卡路里, 热量单位), still

others just don't like breakfast food.

    But the bottom line is that eating in the morning is very important when you're trying to lose weight.

"Eating just about anything from 300 to 400 calories would be better than nothing at all," says Katherine

Brooking, R.D., who developed the super-easy eating plan for this year's "SELF CHALLENGE". And

even pizza can be healthy if it's loaded with vegetables, and you stick to one small piece.

    Breakfast is one meal I never miss, and the same goes for most weight loss success stories. Research

shows that eating breakfast keeps you from overeating later in the day. Researchers at the University of

Southern California found that breakfast skippers have a bigger chance of gaining weight than those who

regularly have a morning meal.

    So eat something in the morning, anything. I know plenty of friends who end up having no breakfast

altogether, and have just coffee or orange juice. I say, try heating up last night's leftovers-it may sound

crazy, but if it works for you, do it! I find if I tell myself, "You can always eat it tomorrow," I put away

the leftovers, instead of eating more that night. Try it … you may save yourself some pre-bedtime calories.

And watch your body gain the fat-burning effects.

1. Paragraph 2: [ ]

A. Women skipping breakfast.

B. Saving calories.

C. Excuses of not having breakfast.

D. Breakfast is overlooked.

2. Paragraph 3:[ ]

A. The bottom line in the morning.

B. Breakfast is necessary.

C. SELF CHALLENGE.

D. Pizza loaded with vegetables.

3. Paragraph 4: [ ]

A. Breakfast prevents people from overeating.

B. Weight loss success stories.

C. University of Southern California.

D. Breakfast skippers in California.

4. Paragraph 5: [ ]

A. Friends without breakfast.

B. Leftover is some good kind of breakfast.

C. Eat it tomorrow.

D. Save pre-bedtime calories.

题型:单项选择题

高铁酸钾(K2Fe04)是具有紫色光泽的粉末,它是一种集氧化、吸附、凝聚、杀菌、灭藻的新型、高效的多功能水处理剂.干燥的高铁酸钾在198℃以下是稳定的,受热易分解、变质.根据上述信息,请回答下列问题:

(1)高铁酸钾的物理性质是______;

(2)高铁酸钾中铁元素的化合价为______;

(3)为防止高铁酸钾变质,保存时应注意______.

题型:单项选择题

冯友兰是现代中国历史上最负盛名的哲学家之一,他在30年代出版的《中国哲学史》和在80年代完成的()至今仍然是世界上影响最大的中国哲学通史之作。

A、《中国哲学史再编》

B、《中国哲学史又编》

C、《中国哲学通史》

D、《中国哲学史新编》

题型:单项选择题

带下过少的常见病因是()

A.脾虚肝郁

B.精血不足

C.血枯瘀阻

D.湿热下注

E.脾肾两虚

题型:单项选择题

下列哪一个描述是Internet比较恰当的定义

A.一个协议

B.一个由许多个用络组成的网络

C.OSI模型的网络层

D.一个网络结构

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