液体的流动状态用（）来判断，其大小与管内液体的（）、（）和管道的（）有关。
参考答案：雷诺数；平均流速；运动粘度；直径
With the help of the computer, information can ______ every corner of the world very quickly.
A．get
B．reach
C．arrive
D．return
He is a local govemment administrator,_________, he is a civil servant. [ ]
A. such as
B. for example
C. that is
D. it is
