狗的细胞中,属于能量转换器的是( ) A.叶绿体 B.细胞核 C.线粒体 D.叶

题型:选择题

问题:

狗的细胞中,属于能量转换器的是(  )

A.叶绿体

B.细胞核

C.线粒体

D.叶绿体和线粒体

考点:细胞中的物质和能量植物细胞结构和功能动物细胞结构和功能
题型:选择题

下面的一元二次方程中,常数项为5的方程是(  )

A.5x2-3x+1=0

B.3x2+5x+1=0

C.3x2-x+5=0

D.3x2-x=5

题型:选择题

潜油电泵机组故障表现一般有五种,常见的是()。

A、砂卡、砂埋

B、死油、死蜡卡阻

C、小物件卡阻

D、电缆脱落堆积卡阻

题型:选择题

当细胞膜内的静息电位负值加大时,称为膜的

A.极化

B.超极化

C.复极化

D.反极化

E.去极化

题型:选择题

南北朝时出现在历史记载中,到唐代变得相当强大,与唐代和平交流居多,且主要居住在今西藏地区的民族是( )

A.羌

B.吐蕃

C.鲜卑

D.回纥

题型:选择题

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.

3()

A.quantity

B.qualifying

C.quality

D.qualified

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