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固态继电器可以实现高频通断的控制

【参考答案】

正确

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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 fulltime work for a social agency. Just as there are opportunities for voluntary service 【B1】______ (VSO) for young people before they take up full-time employment, 【B2】______ there are opportunities for overseas service for 【B3】______ technicians in developing countries. Some people, 【B4】______ those who retire early, 【B5】______ their technical and business skills in countries 【B6】______ there is a special neeD.So in considering voluntary or 【B7】______ community service there are more opportunities than there 【B8】______ were when one first began work. Most voluntary organizations have only a small fulltime 【B9】______ , 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. 【B10】______ some ways they may seem more casual and less efficient, but one should not 【B11】______ them by commercial criteriA.The people who work with them do so for different reasons and with different 【B12】______ , both personal and 【B13】______ . One should not join them 【B14】______ to arm them with professional expertise; they must be joined with commitment to the 【B15】______ , not business efficiency. Because salaries are 【B16】______ or non-existent many voluntary bodies offer modest expenses. But many retired people take part in community service for 【B17】______ , simply because they enjoy the work.Many community activities possible 【B18】______ retirement were also possible during one's working life but they are to be undertaken 【B19】______ seriously for that. Retired people who are just looking for something different or unusual to do should not consider 【B20】______ community servicE.【B1】______A.overseaB.overseaC.overseasD.overseas
A.B.
C.
【B1】______
A.oversea
B.oversea
C.overseas
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