Comprehensive Nuclear-Test-Ban Treaty; Conclusion of effective international arrangements to assure non-nuclear-weapon States against the use or threat of use of nuclear weapons; General and complete disarmament;Letter dated 12 October 1993 from the Permanent Representative of China to the United Nations addressed to the Secretary-General General Assembly First Committee Forty-eighth session (1993) China Correspondence 1993-10-11 A/C.1/48/3 EN