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.
全天候海关监管功能，现场商检、通关、熏蒸、安全防疫，及时方便客户。
Serving with whole day custom inspection, quarantine, and package suffocation on site for customers' convenience.
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