【简答题】视距测量水平视线观测时上丝1.425m,下丝1.689m,中丝1.557m,仪高1.480m,则视距D=_________m,高差h=_________m。
【单选题】对于 NPN 型三极管来说,若测得其基极电位 =2.7V ,发射极电位 =2V ,集电极电位 =2.7V ,则该三极管工作在( )。
【简答题】owing to/due to/because of
【多选题】where will a summer Davos conference most likely to be held?
【单选题】DAVOS, Switzerland—A year ago, at the Davos World Economic Forum, I saw elephants fly. Yes, sir, right here in the Swiss Alps I saw big ideas defying gravity. At this year's Davos forum, though, all t...
A.
bring up some interesting facts.
B.
criticize some irresponsible words.
C.
introduce some political figures.
D.
point out the future of the world's political situation.
【单选题】对于NPN型三极管来说,若测得其基极电位 =2.7V ,发射极电位 =2V ,集电极电位 =2 .7 V ,则该三极管工作在( )。
【单选题】对于NPN型三极管来说,若测得其基极电位 =2.7V ,发射极电位 =2V ,集电极电位 =2 .7 V ,则该三极管工作在( )
【单选题】下列关于液体混合物平均密度计算方法正确的是:
【单选题】对于NPN型三极管来说,若测得其基极电位Vb=2.7V,发射极电位Ve=2V,集电极电位Vc=2.7V,则该三极管工作在( )。