液体紊流的特点是什么？
参考答案：
液体流动时，各质点都呈现出杂乱无章的紊乱状态，运动轨迹不规则，除沿流动方向的位移外，还有垂直于流动方向的位移。
— Where did you find the professor who made the speech yesterday?
— It was in the hall_______ the students often have a meeting.
A．where
B．which
C．that
D．when
小肝癌是指肿块长径小于等于（）。
A.1cm
B.2cm
C.3cm
D.4cm
E.5cm
