When the inner road is under construction, warnings, fences and the red pilot lights at night must be set up.

厂区路面施工时，要设安全遮栏和标记，夜间设红标灯。

youdao

When the inner road is under construction, warnings, fences and the red pilot lights at night must be set up.

厂区路面施工时，要设安全遮栏和标记，夜间设红标灯。

youdao