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【单选题】
How Men Face the Fat Problem It is a pleasure to see men of a certain age worrying about their weight. Listening to them is not such a pleasure. Because the men are new at the game, they don't hesitate to discuss the fat problem incessantly. However, women of the same age do not discuss the fat problem, especially not in mixed company. They prefer to face the problem with quiet dignity. Discussing the problem might only draw attention to some stray body part that may be successfully tucked away under an article of clothing. The age at which a man begins to explore the fat problem can vary. The actual problem can manifest itself in the early 30's, but broad-range discussion usually starts later. There are early nonverbal symptoms. I've watched the rugged journalist who shares my apartment sneak by with a Diet Coke. His shirts are no longer neatly tucked in to display a trim waist. Recently he has begun to verbalize his anxiety. He tells me, with a sheepish grin, that he is taking his suits to Chinatown to have them 'tailored.' Still-older man have lost their dignity and rattle on unabashedly. Often, wives and children play important roles in their fat-inspection rituals. Take my oldest brother, a former college football player, as an example. His daughter says that several times a day he will stand at attention and call out, 'Fat, medium or thin?' She knows the correct answer: medium. Thin would be an obvious stretch, and fat may not get her that new video. According to his wife, he stands in front of the mirror in the morning (before the day's meals take their toll), puts his hands behind his head and lurches into a side bend, then clutches the roll that has developed and says, 'Am I getting fatter?' His wife is expected to answer, 'You look like you may have lost a few pounds.' And then there are the ex-husbands, a pitiful group. They are extremely vocal. When I go to the movies with one, he confides that he is suffering from great hunger because he is dieting. He hasn't eaten since the pancakes and sausages he wolfed down that morning. He pauses in his monologue while he buys his popcorn. After the movie, we sprint to a restaurant, where he again pauses to devour a basket of bread. Before he orders his chaste salad and soup, he grows plaintive. Do I think he's fat? Men of a certain age are always ready to talk about their fat problem.
A.
Right
B.
Wrong
C.
Not mentioned
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【单选题】表示当前动画与前一动画同时开始播放为()
A.
单击时
B.
上一动画之后
C.
与上一动画同时
D.
上一动画之前
【单选题】在反应A+B==C+D中,已知25g A与10g B恰好完全反应生成5g C。当反应有6g D生成时,参加反应的A是 [     ]
A.
10g
B.
5 g
C.
20g
D.
25g
【单选题】一定温度下,对某一反应 A(g)+3B(g) 2C(g),反应放热,以下说法不正确的是(  )
A.
反应是可逆反应
B.
反应有限度
C.
1molA与3molB混合充分反应能得到2mol的C
D.
反应限度受反应条件的影响
【单选题】表示当前动画与前一动画同时开始播放为( )
A.
单击时
B.
上一动画之后
C.
上一动画之前
D.
与上一动画同时
【单选题】反应A + B === C + D,8g A和12g B恰好完全反应,生成C和9g D,则生成C的质量为
A.
9g
B.
10g
C.
11g
D.
12g
【单选题】一般情况下,固定铰链约束的约束反力可以用()来表示。
A.
一对相互垂直的力
B.
一个力偶
C.
一对互相垂直的力和一个力偶
D.
一对互相垂直的力和两个力偶
【单选题】已知A、B两种物质反应生成C:A+B C。用7 g A和2 g B或4 g A和5 g B充分反应都可得6 g C,现取A、B固体混合物共9 g,充分反应后得到7.5 g C。此混合物中A和B的质量分别是( )。
A.
A为6.5g、B为2.5g
B.
A为5g、B为4g
C.
A为6.5g、B为2.5g或A为5g、B为4g
D.
无法确定
【简答题】在反应A + 3B =' 2C' + 3D中,已知2.3g A与4.8g B恰好完全反应生成4.4g C,则该反应中,B与D的质量之比为 。(2分)
【单选题】在化学反应A+B→C中,5g A与足量B反应生成8g C,则参加反应的B的质量是
A.
8g
B.
5g
C.
3g
D.
2g
【单选题】对可逆反应A(g)+B(g)?C(g)(正反应为吸热反应),下列图象正确的是(  )
A.
B.
C.
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