设备的五层防护线是什么?
参考答案:
(1)操作人员的日常点检
(2)专业点检员的专业点检
(3)专业技术人员的精密点检和精度测试检查
(4)设备技术诊断
(5)设备维修
— Don't be mad at me. I'm only five minutes late.
— This is the last time I'm waiting for you._______.[ ]
A. I make it
B. I put it
C. I mean it
D. I get it
排比和层递的区别?