The rate of population growth is
fastest in underdeveloped countries. In these countries a high birthrate is
accompanied by a lowered death rate thanks to improved standards of public
health. Ideally it should be possible to counter balance the effect of a reduced
death rate by all increased use of family planning. In practice, however,
population control is a complex matter. Throughout history people have
determined the size of their families according to the cultural values of their
societies. Population control has long been a subject of discussion among researchers. Some have argued that the supply of good land is limited. In order to feed a large population, bad land must be cultivated and the good land overworked. As a result, each person produces less in a given amount of time and this means a lower average income than A. a rise in work efficiency B. a redaction in average income C. a decline in grain production D. a shortage of farm workers [填空题]在DK-1制动机系统中,分配阀缓解塞门156控制的是( )通大气的通路
[单选题]现场使用的安全工器具应( )并符合有关要求。
A.A.规范 B.B.合格 C.C.齐备 D.D.可靠 [单选题]气举完毕后,若用油嘴控制放气,最好选用的油嘴是()mm。
A.3 B.2 C.5 [单选题]周围型肺癌是指肿瘤发生在
A.主支气管 B.肺叶支气管 C.肺段支气管 D.肺段以下细支气管以上 E.细支气管以下 [单选题]T•JK型减速器全缓解时间不大于()。
A.1.39 s B.1.49 s C.1.94 s D.2.84 s [单项选择]生物素-亲和素系统对反应起放大作用,因每个亲和素可结合的生物素为()。
A. 2个 B. 3个 C. 4个 D. 5个 E. 6个 [名词解释]广告效果调查
[判断题]动车组列车商务座基本流程服务。途中作业:饮品服务。原则上茶水、饮料均应使用一次性纸杯按需提供服务。
A.正确 B.错误 [多选题]各市公司根据省公司下发的年度目标值,结合()将年度目标值按照区县公司、逐月进行分解。
A.停电需求池 B.工程竣工时间 C.历史故障停电情况 D.带电作业的开展 [单项选择]由于某种全局性的因素引起的股票投资收益的可能性变动,这种因素对市场上所有股票收益都产生影响的风险是( )。
A. 政策风险 B. 非系统性风险 C. 利率风险 D. 系统性风险 [单项选择]A 处方 B 普通处方、急诊处方、儿科处方 C 中药饮片处方 D 麻醉药品和第一类精神药品处方 E 医疗用毒性药品、第二类精神药品处方保存期限为1年的是
[简答题]线路作业中使用的滑车应注意哪些事项?
[简答题]汇集了丰富的生物资源,位于中国西藏地区世界上最深的峡谷是什么?
[单选题]574.转盘气路主要由转盘气开关控制,其手柄有( )两个位置。
A.A、“高”、“低” B.B、“合”、“关” C.C、“离”、“开” D.D、“离”、“合” [多选题]竣工投运前的验收,试验结束后及时将试验电源(),并对容性被试设备进行充分的()后,方可拆除()。
A.断开 B.放电 C.试验接线 D.接地线 我来回答: 提交
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