跪求"强电工程师""弱电工程师""土建工程师""给排水、暖通工程师""办公室主任"的英文翻译

强电工程师
heavy-current engineer

弱电工程师
milliampere man

土建工程
civil work engineer

给排水、暖通工程师
engineer for water supply and sewerage works and heating and ventilating

办公室主任
chief of office