题目内容
将圆柱的圆柱面分成前、后两个半柱面，则在圆柱的正投影投影图中，可见的是（）
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当形体的三面投影图是由三个矩形线框组成时，我们可以判断该形体是四棱柱。
当圆锥的底平面平行水平投影面时，它的底平面的水平投影是完全不可见的。
U2R4 P1:These attempts to prevent migration are futile, and above all, wrong.这些企图是徒劳的，而且是错误的。U2R4 P2: Secondly, cities need a longer-term and broader vision of the use of urban space to reduce poverty and promote sustainability.其次，城市需要制定更长远、更广阔的计划来开发城市空间，从而减少贫困、促进可持续发展。Poor sanitation does exist. But ____________________ (阻止城市发展是无用的). What we should do is ____________________(促进环境的持续发展).
U2R4 P1:Many policymakers continue to try toprevent urban growthby discouraging rural-urban migration, with measures such as driving the rural migrants out anddenying them services.许多政策制定者依然试图阻止城市化进程，不赞成人们到城市来生活：采取的措施是驱逐流动人口，拒绝给他们提供相应的服务。Many policymakers continue to try to ____________________ (制止城市规模的发展) with measures such as driving the rural migrants out and____________________ (拒绝给予他们各项服务).
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