飞剪剪切的特点？
参考答案：
在钢材运行过程中完成剪切任务，因而要求钢材运行速度大致与剪刃圆周速度相同。这类剪机大都布置在半连续式或连续式轧机作业线上。
Which of the following statement is closest in meaning to the passage you have just heard a. The WTO ministerial conference held at Cancun is disappointing because the poor countries could not participate in the event. b. The Cancun ministerial meeting was intended to create a more open and equitable trading system. c. The main objective of the Cancun conference was to help the poorest countries in the world to develop their economy. d. Opening up the market in poor countries would have a negative impact on their national economic development.
采用悬滴法检查不染色标本时在显微镜下若看见细菌在液体中能定向地从一处泳到另一处，这称为( )
A．分子运动B．布朗运动C．分子运动与布朗运动D．真正运动E．分子运动或布朗运动
