从一个5元素集合中允许重复地无序选取3个元素有 [填空1]种不同的方式。

未分类题对一角度观测四回，各测回观测值与该角度的真值之差分别为-9'、+8'、+7'、-6'，则角度测量的中误差为( )。D.±8.8'

单项选择题据《灵枢•本神》,“心有所忆谓之( )” A. 意 B. 心 C. 志 D. 思 E. 虑

未分类题During the conversation, the man seems to be more interested in______.A.the size of the showB.the cost of the standC.the basic furnitureD.the visitor number

未分类题Sue Green seems to be more interested in John's experience of______.A.working in a paper factoryB.working in a youth clubC.looking after his brother and sisterD.looking after his young friends

未分类题The advertisements will be placed in all of the following EXCEPT______.A.family magazinesB.Sunday newspaperC.morning televisionD.teenage magazine