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问题 选择题

用NA表示阿伏加德罗常数的值，下列说法错误的是

A．24g Mg变为Mg2+时失去的电子数为2NA

B．常温常压下，11.2LN2中含有的分子数为0.5NA

C．1L 0.1mol·L—1NaNO3溶液中含有的钠离子数为0.1NA

D．32g O2中含有氧原子的个数为2NA

答案

答案：B

单项选择题

In the rarefied world of the corporate board, a good network matters. (1) often involves word-of- mouth recommendations: getting on a (2) is easier if you have the right connections. New research suggests men use (3) better than women.

Marie Lalanne and Paul Seabright of the Toulouse School of Economics (4) the effect of a network on (5) using a database of board members in Europe and America. They find that if you were to compare two executive directors, (6) in every way except that one had 200 ex-colleagues now (7) boards and the other 400, the latter, (8) , would be paid 6% more. For non-executives the gap is 14%.

The really (9) finding concerns the difference between the sexes. Among executive-board members, women earn 17% less than their male (10) . There are plenty of plausible explanations for this (11) , from interruptions to women’s careers to old-fashioned (12) . But the authors find that this pay gap can be fully (13) by the effect of executives’ networks. Men can leverage a large network into more senior positions or a seat on a more (14) board; women don’t seem to be able to.

Women could just have (15) connections with members of their networks. "Women seem more inclined to build and rely on only a few p relationships," says Mr. Seabright. Men are better at developing (16) acquaintances into a network, and better at maintaining a high personal (17) through these contacts. Women may, of course, also be hurt by the existing (18) of men on boards and a male (19) for filling executive positions with other men. But a tendency to think of other men first will be (20) if talented women don’t stay on the radar. (289 words)

6（）

A．identical

B．similar

C．differential

D．distinctive
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单项选择题

阶梯圆轴的最大切应力发生在（）。

A.扭矩最大的截面

B.直径最小的截面

C.单位长度扭转角最大的截面

D.不能确定
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