During the dock repair, each sea valve must be disassembled, cleaned and ground well.Before it reassemble the sealing surface between the valve and the valve seat should be checked by ()
A. chief engineer
B. surveyor
C. the engineer
D. the technique personnel of the shipyard
《中华人民共和国无线电管理条例》第十三条规定,在省、自治区范围内跨地区通信或者服务的无线电台(站),省、自治区机关(含其在省、自治区人民政府所在地直属单位)设置使用的无线电台(站),由()审批。
A. 省、自治区无线电管理机构
B. 直辖市无线电管理机构审批
C. 国家无线电管理机构
D. 设区的市无线电管理机构审批