A.6項(xiàng) B.7項(xiàng) C.8項(xiàng) D.9項(xiàng)
A.焊接 B.螺栓 C.鉚接 D.鋼絲繩捆綁
A.應(yīng)加套管 B.應(yīng)加襯墊 C.用鋼絲繩直接套上 D.應(yīng)加黃油