單項(xiàng)選擇題
A.Sb=52d2B.Sb=612d2C.Sb=520d2D.Sb=566d2
A.鋼絲繩中鋼絲的總根數(shù)B.鋼絲繩中每根鋼絲的截面積C.受載不均勻系數(shù)D.鋼絲抗拉強(qiáng)度
A.74124NB.92618NC.67515ND.20000N
A.5mmB.11mmC.9mmD.30mm
A.0.33B.0.43C.0.38D.0.25
A.43.3kNB.35.5kNC.25kND.50kN
A.安全系數(shù)B.面積C.截面系數(shù)D.慣性矩
判斷題