普通平键的工作面是 （         ），工作面是接触表面，故绘制一条线。 A.
顶面 B.
底面 C.
两侧面

单项选择题连续轨迹控制方式（CP）的特点是连续的控制工业机器人末端执行器在作业空间的位姿，要求其严格按照预定的轨迹和速度在一定的精度范围内运动，而且速度可控，轨迹光滑，运动平稳，以完成工作任务。（ ）A.对B.错

多项选择题不是所有出席会议的人都同意发言者的意见。 A、Not all those who were present at the conference agreed with the speaker. B、Some of those who were present at the conference agreed with the speaker. C、Some of those who were present at the conference diagreed with the speaker. D、All those who were present at the conference did not agree with the speaker.