【单选题】血友病人出现很小伤口时,也会血流不止,这是由于血液中哪种成分的数量过少?( )
【单选题】— Do you know _____? — For two days. [ ]
A.
how long was Nancy back
B.
how long Nancy was back
C.
how long has Nancy been back
D.
how long Nancy has been back
【单选题】当工程进度计划用非时标网络图表示时,可以采用( )进行实际进度和计划进度的比较。
【单选题】小米科技做的非常成功,它就是通过论坛、微博、QQ空间、微信来实现用户的参与度。属于用户思维的( )