流体在圆管内层流流动时，（）是最大速度的一半。
A.平均速度；
B.最大速度；
C.中间速度；
D.瞬时速度。
参考答案：A
根据句意，用所给动词的适当形式填空。
小题1:—We haven’t heard from Jane for a long time.
—What do you suppose _______(happen) to her?
小题2:The second Youth Olympic Games _______(hold ) in Nanjing in 2014.
小题3:I tried many ways I could think of _______ (stop) the little boy from crying.
小题4:Some students seem to have difficulty _________(control)their actions.
小题5:The little girl dare __________ (swim) in this deep river now.
下列纠纷中，可以适用《仲裁法》仲裁解决的是( )。
A．婚姻纠纷
B．买卖合同
C．收养纠纷
D．继承纠纷
