Industrial rigid round laminated tubes and rods based on thermosetting resins for electrical purposes - part 1 : general requirements 电工用工业刚性圆热固树脂层压管和棒材
Industrial rigid round laminated tubes and rods based on thermosetting resins for electrical purposes - general requirements 电工用工业刚性圆热固树脂层压管和棒材.一般要求