《公路沥青路面设计规范》假设层间关系不是( )。A．完全滑动 B．完全连续 C．有时

四大家鱼：                                          。

2005年3月26日晚京沪高速公路淮安段发生重大交通事故，导致35吨液氯大面积泄漏，造成28人死285人伤．氯气是一种黄绿色的有毒气体，密度比空气大，能溶于水，并能与碱反应．氯气被吸入人体后，会导致呼吸困难，甚至窒息死亡．事故发生后，附近居民被紧急疏散，戴防毒面具的消防人员不停地向空气中喷射水幕及碱溶液，及时有效地控制了氯气的扩散消防人员向空中喷射氢氧化钠溶液吸收氯气（反应原理：Cl₂+2NaOH=NaCl+NaClO+H₂O）．就此回答下列问题：

（1）根据上述信息请你写出氯气的两条物理性质______；

（2）氯气向四周扩散，这一现象说明分子______；

（3）消防人员所戴的防毒面具中的活性炭的作用是______；

（4）实验室制取氯气的反应原理是：MnO₂+4HCl=X+2H₂O+Cl₂↑，X的化学式为______．

选出点数为1、2的扑克牌各3张，反扣在桌面上．

游戏规则：

①每次摸3张牌，记下3张牌上点数的和，然后放回去，另一个人再摸，2人摸牌次数相同．

②3张牌上点数的和大于4，一方得1分；否则，另一方就得1分．

③积分高者赢．

这个游戏规则公平吗？为什么？试说明理由．

关于成分输血的优点，叙述最正确的是（）。

A.制品容量小，有效成分的浓度和纯度高，治疗效果好

B.使用相对安全，不良反应少

C.减少输血相关传染病的发生

D.综合利用，节约血液资源

E.以上答案都正确

A researcher studying drug addicts found that, on average, they tend to manipulate other people a great deal more than nonaddicts do. The researcher concluded that people who frequently manipulate other people are likely to become addicts.
Which of the following, if true, most seriously weakens the researcher’s conclusion

A．After becoming addicted to drugs, drug addicts learn to manipulate other people as a way of obtaining drugs.

B．When they are imprisoned, drug addicts often use their ability to manipulate other people to obtain better living conditions.

C．Some nonaddicts manipulate other people more than some addicts do.

D．People who are likely to become addicts exhibit unusual behavior patterns other than frequent manipulation of other people.

E．(E) The addicts that the researcher studied were often unsuccessful in obtaining what they wanted when they manipulated other people.