【单选题】What does the word 'trade-offs' in Paragraph 5 mean?
【判断题】switch中的分支中的default的顺序不一定要在最后
【判断题】Trade-offs are involved in most policy decisions.
【单选题】HTML5 中,( )元素经常与 details 元素配合使用,作为 details 元素的第一个子元素。
【单选题】在下图的定轴轮系中,根据已知齿轮1转向(箭头向下),判断齿轮6的转动方向(箭头)是()。
【简答题】在图示的定轴轮系中,已知各齿轮的齿数分别为 z 1 =17 , z 2 =25 ,z2' =20 , z 3 =34 , z 4 =40 ,z4' =30 , z 5 =45 , z 5' =20 , z 6 =51 ,齿轮 1 的转速 n 1 =800r/min ,转向如图所示。求传动比 i 16 及齿轮 6 的转向。
【单选题】某社区的社工组织了青少年就业辅导小组,为小组成员提供就业信息,组织技能培训,该社工的行为属于青少年社会工作的( )服务。
【单选题】HTML5中,( )元素经常与details 元素配合使用,作为details 元素的第一个子元素。
【单选题】The concept of trade-offs would become irrelevant if
A.
scarcity were eliminated.
B.
poverty were eliminated.
C.
capital were eliminated.
D.
we were dealing with a very simple, one-person economy.