下列装置或操作能达到实验目的的是 A．①防止铁钉生锈 B．②构成铜锌原电池 C

对于钛系催化剂树脂而言，当（）时，树脂熔融增加。

A、分子量增加

B、氢气／乙烯比增加

C、反应温度增加

D、乙烯分压增加

髂内动、静脉和淋巴结位于（）

A.两侧梨状肌前内方

B.两侧闭孔内肌内方

C.坐骨直肠窝内

D.子宫两旁

E.直肠旁

时效性.刺激性.多样性和直接性是（）的特征。

A.广告

B.人员推销

C.公共关系

D.营业推广

There is virtually no limit to how one can serve community interests, from spending a few hours a week with some charitable organization to practically full-time work for a social agency. Just as there are opportunities for voluntary service (1) (VSO) for young people before they take up full-time employment, (2) there are opportunities for overseas service for (3) technicians in developing countries. Some people, (4) those who retire early, (5) their technical and business skills in countries (6) there is a special need.

So in considering voluntary or (7) community service, there are more opportunities than there (8) were when one first began work. Most voluntary organizations have only a small full-time

(9) and depend very much on volunteers and part-timers. This means that working relationships are different from those in commercial organizations, and values may be different. (10) some ways they may seem more casual and less efficient, but one should not (11) them by commercial criteria. The people who work with them do so for different reasons and with different (12) , both personal and (13) . One should not join them (14) to arm them with professional experience; they must be joined with commitment to the (15) , not business efficiency. Because salaries are (16) or non-existent many voluntary bodies offer modest expense. But many retired people take part in community service for (17) , simply because they enjoy the work.

Many community activities possible (18) retirement were also possible during one’s working life but they are to be undertaken (19) seriously for that. Retired people who are just looking for something different or unusual to do should not consider (20) community service.

17（）

A.free

B.freedom

C.money

D.something

下列是真理的客观性的含义是（）

A、真理的内容是客观的

B、真理是自然规律

C、真理是社会规律

D、真理是正确认识