沙立度胺( )。 A．灰婴综合征 B．新生儿溶血 C．高胆红素血症 D．海豹畸胎

60年代美国化学家鲍林提出了一个经验规则：设含氧酸的化学式为H_nRO_m，其中(m－n)为非羟基氧原子数，鲍林认为含氧酸的强弱与非羟基氧原子数(m－n)的关系见下表．试回答下列问题：

(1)按此规则判断H₃AsO₄、H₂CrO₄、HMnO₄酸性由弱到强的顺序为________．

(2)H₃PO₃和H₃AsO₃的形式一样，但酸性强弱相差很大．已知H₃PO₃为中强酸，H₃AsO₃为弱酸，试推断H₃PO₃和H₃AsO₃的分子结构________．

(3)按此规则判断碳酸应属于________酸，与通常认为的碳酸的强度是否一致？________.其可能的原因是___________________．

我国《公司法》规定，在国有独资公司中，所有者投入的资本全部作为( )入账。

A．实收资本

B．资本公积

C．盈余公积

D．未分配利润

某同学在探究摩擦力的实验中采用了如图所示的操作，将一个长方体木块放在水平桌面上，然后用一个弹簧秤对木块施加一个水平拉力F，下表是他记录的实验数据．木块的重力为20.0N，重力加速度g=10.0m/s²，根据表格中的数据回答下列问题：

实验次数	运动状态	水平拉力F/N
1	静止	3.23
2	静止	4.06
3	匀速	4.80
4	匀加速	7.60

（1）木块与桌面间的最大静摩擦力F_fm＞______N；

（2）木块与桌面间的动摩擦因数μ=______；

（3）实验次数4中木块的加速度a=______m/s²．

It is hardly surprising that clothing manufacturers（生产商） follow certain uniform standards for various features of clothes．What seems strange, however, is that the standard adopted for women is the opposite of the one for men．Take a look at the way your clothes button．Men’s clothes tend to button from the right, and women’s form the left．Considering most of the word’s population----men and women----are right-handed, the men’s standard would appear to make more sense for women．So why do women’s clothes button from the left?

History really seems to matter here．Buttons first appeared only on the clothes of the rich in the 17th century, when rich women were dressed by servants．For the mostly right-handed servants, having women’s shirts button from the left would be easier．On the other hand, having men’s shirts button form the right made sense, too．Most men dressed themselves, and a sword drawn from the left with the right hand would be less likely to get caught in the shirt．

Today women are seldom dressed by servants, but buttoning form the left is still the standard for them．Is it interesting? Actually, a standard, once set, resists change．At a time when all women’s shirts buttoned form the left, it would have been risky for any single manufacturer to offer women’s shirts that buttoned from the right．After all, women had grown so used to shirts which buttoned from the left and would have to develop new habits and skills to switch．Besides, some women might have found it socially awkward to appear in public wearing shirts that buttoned from the right, since anyone who noticed that would believe they were wearing men’s shirts．

小题1:What is surprising about the standard of the clothing industry?

A．It has been followed by the industry for over 400 years．

B．It is different for men’s clothing and women’s．

C．It woks better with men than with women．

D．It fails to consider right-handed people．小题2:What do we know about the rich men in the 17th century?

A．They tended to wear clothes without buttons．

B．They were interested in the historical matters．

C．They were mostly dressed by servants．

D．They drew their swords from the left．小题3:Women’s clothes still button from the left today because        ．

A．adopting men’s style is improper for women

B．manufacturers should follow standards

C．customs are hard to change

D．modern women dress themselves小题4:The passage is mainly developed by         ．

A．analyzing causes

B．making comparisons

C．examining differences

D．following the time order

试述毒理学安全性评价选用原则有哪些？