单项选择题
A.16/17槽B.18/19槽C.6/7槽D.2/3槽
A.绝缘垫,弹垫,平垫B.绝缘垫,平垫,弹垫C.平垫,弹垫,绝缘垫D.弹垫,平垫,绝缘垫
A.16mm2B.10mm2C.14mm2D.6mm2