a级国产大片在线免费观看專業從事互動視頻_欧美日韩国产主播在线_欧美亚洲日韩理论片在线_中文字幕第二页_国产精品麻豆影院_在線觀看免費三級無碼_亚洲日韩av成人影视一区_(凹凸視頻)久久精品免费_军人野外吮她的花蒂无码视频_中国gay男男av毛片免费看

In line with the national standard gb/t17906-1999 "hydraulic breaking tools general technical conditions", expansion force 30-42KN, the maximum opening distance ≥125mm, and can cut the diameter of 20mm round steel and 15mm thickness of the plate; The shear extender completes from the closed position to the maximum opening, Then back to the original position and 50 consecutive cycles, should also be continuous shear length 100mm, diameter of 14mm round steel or long 100mm, wide 50mm, thick 2.4mm steel plate 50 times, after the test action is normal, no leakage and abnormal phenomenon, the edge should be no curl, blade phenomenon.