排水泵站中的格栅起保护水泵的作用，格栅倾斜角度为（）。A．10°～50° B．20°

如图15所示，电源电压为12V，且保持不变，已知滑动变阻器R1的最大值为48Ω，R0为定值电阻，小灯泡L标有“6V  3W”字样。求:

（1）灯泡正常发光时的电阻多少？

（2）S闭合，S1、S2都断开时，要使灯泡正常发光，滑动变阻器接入电路中的阻值为多大?(假设灯丝电阻不变)

（3）保持（2）中滑动变阻器的位置不变，闭合S、S1、S2，此时电流表示数相比（2）中变化了1A。求R0的阻值是多少Ω？

（4）S、S1、S2都闭合时，调节滑动变阻器滑片到某处时，整个电路消耗的总功率最小，这个最小功率是多少？

Most parents, I suppose, have had the experience of reading a bedtime story to their children.And they must have 1 how difficult it is to write a 2 children's book.Either the author has aimed too 3 , so that the children can't follow what is in his (or  more often, her) story, 4 the story seems to be talking to the readers.

The best children's books are 5 very difficult nor very simple, and satisfy both the 6 who hears the story and the adult who 7 it.Unfortunately, there are in fact 8 books like this, 9 the problem of finding the right bedtime story is not 10 to solve.

This may be why many of books regarded as 11 of children's literature were in fact written for 12 .“Alice's Adventure in Wonderland”is perhaps the most 13 of this.

Children, left for themselves, often 14 the worst possible interest in literature.Just leave a child in bookshop o 15 and he will 16 willingly choose the books written in an imaginative way, or have a look at most children's comics, full of the stories and jokes which are the 17 of teachers and right-thinking parents.

Perhaps we parents should stop trying to brainwash childrensintos 18 our taste in literature.After all children and adults are so 19 that we parents should not expect that they will enjoy the 20 books.So I suppose we'll just have to compromise over that bedtime story.  

1.A.hoped      B.realized       C.told     D.said

2.A.short B.long     C.bad      D.good

3.A.easy        B.short    C.high     D.difficult

4.A.and   B.but      C.or D.so

5.A.both  B.neither C.either   D.very

6.A.child B.father   C.mother D.teacher.

7.A.hears B.buys    C.understands D.reads

8.A.few   B.many          C.a great deal of  D.a great number of

9.A.but   B.however      C.so D.because

10A.hard B.easy     C.enough D.fast

11.A.articles   B.work    C.arts      D.works

12.A.grown ups     B.girls     C.boys    D.children

13.A.difficult  B.hidden C.obvious       D.easy

14.A.are        B.show    C.find     D.add

15.A.school    B.home   C.office   D.library

16.A.more      B.less      C.able     D.be

17.A.lovingness     B.interests      C.objections    D.readings

18.A.receiving       B.accepting     C.having D.refusing

19.A.same      B.friendly       C.different      D.common

20.A.common B.avarage       C.different      D.Same

下列哪项方法不能减少非特异性染色？（）

A.第一抗体用单克隆抗体

B.染色过程中避免切片干燥

C.在用第一抗体前，加与制备第一抗体不同动物的免疫血清进行封闭

D.使用牛血清白蛋白进行封闭

E.消除内源性过氧化物酶和生物素

某依法必须进行招标的工程施工项目采用资格后审的方式组织公开招标，招标文件规定，投标人需要提交投标保证金。在投标截止时间前收到了投标人A、B、C、D、E提交的投标文件。但是投标截止时间后1min，投标人E才向招标人提交了投标保证金。招标人接收了这五份投标文件，投标人代表查验投标文件的密封情况，均符合要求，并组织了开标。
投标人A少携带了一个证件的原件，没能通过招标人组织的资格审查。投标人E没有按时递交投标保证金，招标人当场宣布E的投标文件为无效投标文件，不进入唱标程序。
唱标过程中，投标人B的投标函上有两个投标报价，招标人要求其确认了其中一个报价进行唱标；投标人C在投标函上填写的报价，大写与小写不一致，招标人查对了其投标件中工程报价汇总表，发现投标函上报价的小写数值与投标报价汇总表一致，于是按照其投标函上小写数值进行了唱标；投标人D的投标函没有盖投标人单位印章，同时又没有法定代表人或其委托代理人签字，招标人唱标后，当场宣布D的投标为废标。这样仅剩B、C两个人的投标，招标人认为有效投标少于3家，不具有竞争性，否决了所有投标。
问题

结合案例谈一谈，招标人在唱标过程中针对B、C、D的处理是否正确为什么

连衣裤的特点。