double-silk cover双丝包的双层丝绝缘

double-cycle cover双环覆盖

Double-course cover双层压盖

double-sealed cover复式封盖

double-cover cellphone become翻盖手机

double-cover butt joint[机] 双盖板对接

double-seal manhole cover双重密封人井盖

double-walled airtight cover双壁密封盖

double-faced reinforced concrete cover plate双面钢筋混凝土盖板