6月6日为全国“爱眼日”．人眼中的晶状体相当于凸透镜，眼球后的视网膜相当于___

BTS3006适用于（）。

A.高密度大话务量用户地区

B.人口密集地区，城市

C.室外中等容量广覆盖区域

D.郊区，乡村，车站，机场，公路，铁路等.

表态性批复

In recent years many countries of the world have been faced with the problem of how to make their workers more productive. Some experts say the ___1___ is to make jobs more varied(多样的). But do more varied jobs ___2___ greater productivity? There is evidence to suggest that ___3___variety certainly makes the worker’s life more enjoyable, it doesn’t ___4___ make him work harder. As far as increasing productivity is concerned, then, ___5___ is not an important factor.

Other experts feel that giving the worker___6___ to do his job in his own way is important, and there is no doubt that this is true. The ___7___ is that this kind of freedom can’t easily be given in the modern factory with its complicated(复杂的) machinery which must be used in a ___8___ way. Thus while freedom of choice may be important, there is usually very little that can be done to ___9___ it.

Another important ___10___ is how much each worker ___11___ to the product he is making. In most factories the worker ___12___ only one small part of the product. Some car factories are now ___13___ with having many small production lines rather than one large one, so that each worker contributes more to the production of the cars on his___14___. It would seem that not only is degree of worker contribution an important factor ___15___ it is one we can do something about.

To what___16___ does more money lead to greater productivity? The workers themselves certainly think this is ___17___. But perhaps they want more money only because the work they do is so boring. ___18___ just lets them enjoy their spare time more. A ___19___ argument may explain demands for shorter working hours. Perhaps if we ___20___ making their jobs more interesting, they will neither want more money, nor will shorter working hours be so important to them.

1. A. answer   B. course C. attempt      D. system

2. A. run across      B. lead to       C. result from D. pick up

3. A. because  B. as       C. while  D. as though

4. A. mentally B. physically   C. carefully    D. actually

5. A. variety   B. relaxation C. creativity    D. machinery

6. A. judgement     B. freedom     C. direction    D. comfort

7. A. secret     B. skill    C. problem     D. strength

8. A. amusing B. dull    C. changeable D. fixed

9. A. use  B. create  C. supply D. fear

10. A. measure       B. invention    C. consideration     D. work

11. A. lies       B. sticks  C. objects       D. contributes

12. A. likes     B. equips C. transports   D. sees

13. A. tired     B. pleased      C. worrying       D. experimenting

14. A. own     B. will    C. line     D. hand

15. A. but       B. and     C. so       D. however

16. A. extent   B. quality       C. store   D. difference

17. A. natural  B. important   C. worrying    D. unbelievable

18. A. Rest     B. Sports C. Money       D. Playing

19. A. complete      B. friendly      C. given  D. similar

20. A. advise   B. succeed in  C. object to     D. are tried of

仅限于上肢远端，失去执行精巧动作、熟练动作能力，为双侧或对侧运动区及其纤维或胼胝体前部病变所致（）

A．4～12mg 

B．5～12mg 

C．10～20mg 

D．15～40mg 

E．50～120mg

测定酚类水样时应加（）作为水样保护剂。

A.HgCl₂

B.HNO₃

C.HCl

D.NaOH