-
天为一个周期的巡回检查和维护,控制电梯运行质量。
Inspection and maintenance shall be conducted once every five days to control the performance of elevator operation.
youdao
-
天为一个周期的巡回检查和维护,控制电梯运行质量。
Inspection and maintenance shall be conducted once every five days to control the performance of elevator operation.
youdao