数控机床的操作面板分为（）和键盘和控制键等。
参考答案：显视屏
his bike is lost? He has to go to school on foot.
A．What if
B．How about
C．Can you tell me
D．I don't know
七点法面积井网注水，注水井是采油井井数的（）倍，所以注水强度较高，最终采收率也较高。
A、1
B、2
C、3
D、4
