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

未分类题Where does At &.T face difficulties in particular?A.NationwidE.B.Overseas.C.In large cities.D.In remote towns.

单项选择题将路径快速转换为选区的快捷键是 A、Shift+Enter B、Ctrl+Enter C、Alt D、Alt+Ctrl

未分类题NASA's Constellation Programme would be cancelled mainly because______A.there were more important space missionsB.the space agency lacked funding for the programmeC.the current shuttle missions would continueD.Congress failed to pass President Obama's budget

未分类题When you have finished with the book, don't forget to return to Tim, ______?A.won't youB.don't youC.will youD.do you

单项选择题乳牙期前牙反 牙合 的矫正年龄一般为 A 1-2岁 B 2-3岁 C 3-6岁 D 6岁以上

未分类题The following are all cited as advantages of e-book EXCEPT______.A.imaginative designB.environmental friendlinessC.convenience for readersD.multimodal content