How do I know that the user of the system is who they say they are and only give them access to authorized functions?

如何知道系统用户就是他们所声称的，并只让他们访问经过授权的功能？

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A State railway transport enterprise shall perform the administrative functions as authorized by relevant laws and administrative rules and regulations.

国家铁路运输企业行使法律、行政法规授予的行政管理职能。

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The physical technical functions have attracted more attention from multi-industries experts, applied patents, and have been authorized and accepted by Chinese National Patent Office.

其物理技术功能引起多种行业专家的高度重视，申报专利，已为国家专利局授权、授理。

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The Secretary of State is hereby further authorized to exercise the functions and authorities conferred upon the President by section 105(c) of CISADA (22 U.S.C. 8514(c)) with respect to the promulgation of rules and regulations related to the visa sanctions described therein and to redelegate these functions and authorities consistent with applicable law.

WHITEHOUSE: The White House

The Secretary of State is hereby authorized to exercise the functions and authorities conferred upon the President by section 105(a) of CISADA (22 U.S.C. 8514(a)) with respect to imposition of the visa sanctions described in section 105(c) of CISADA (22 U.S.C. 8514(c)) and to redelegate these functions and authorities consistent with applicable law.

WHITEHOUSE: The White House

The Secretary of State is hereby further authorized to exercise the functions and waiver authorities conferred upon the President by section 401(b) of CISADA (22 U.S.C. 8551(b)) with respect to the requirement to impose or maintain visa sanctions under section 105(a) of CISADA (22 U.S.C. 8514(a)) and to redelegate these functions and waiver authorities consistent with applicable law.

WHITEHOUSE: The White House