题干

COCL2俗名作光气,是有毒气体.在一定条件下,可发生的化学反应为:COCL2(g) CO(g)+CL2(g)△H<0.下列有关说法正确的是(   )

A:在一定条件下,使用催化剂能加快反应速率并提高反应物的平转化率

B:当反应达平衡时,恒温恒压条件下通人Ar,能提高COCl2的转化率

C:单位时间内生成CO和CL2的物质的量比为1:1时,反应达到平衡状态

D:平衡时,其他条件不变,升高温度可使该反应的平衡常数增大

上一题 下一题 0.0难度 选择题 更新时间:2019-04-25 04:25:54

答案(点此获取答案解析)

B

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        Both men and women are living longer thesedays in industrialized countries. ____ In general, they can expect to live six or sevenyears more than men. One reason for this is biological.

        One important biological factorthat helps women live longer is the difference in hormones between men and women.____ Between the ages of about 12 and 50, women producehormones that are involved in fertility(生育能力). These hormones also have a positive effect on the heart andblood flow. In fact, women are less likely to have high blood pressure or to diefrom heart attacks.

 

____  Theyhelp the body defend itselfagainst some kinds of infections. This means that women generally get sick lessoften and less seriously than men. The common cold is a good example: women, onaverage, get fewer colds than men.

        ____Scientists are still not exactly sure howinfluence aging, but they believe that they do. Some think that a woman’s body cellshave a tendency(向) to age more slowlythan a man’s. Others think that a man’s body cells have a tendency to age more quickly.____

A. However, women, on average, live longer.

B.The biological factor plays an important part.

C.Women are also helped by their female genes.

D.The female hormones also protect the body in another way.

E.Recent research seems to support both of these possibilities.

F.Therefore, women are more healthy than men and can live a better life.

G.Hormones are chemicals which are produced by the body to control carious body functions.