按照管道安全局的说法，监管机构通常每3- 5年对管道运营商检查一次。

Regulators typically inspect pipeline operators once every three to five years, according to the agency.

youdao

按照管道安全局的说法，监管机构通常每3- 5年对管道运营商检查一次。

Regulators typically inspect pipeline operators once every three to five years, according to the agency.

youdao