钻井液具有一定的切力，有利于携带和悬浮岩屑、重晶石等。
参考答案：对
船舶航行中遇到紧急情况时，常用的避让措施有（）.
A、减速
B、停车、倒车
C、抛锚制动
D、A、BC都对
Although we may not realize ________, when we talk with others we make ourselves understood not just by words but also by body movements.
A．it
B．them
C．that
D．ourselves
