單項選擇題
A.45-50 B.50-55 C.55-60 D.61-65
A.圓錐滾子軸承 B.深溝球軸承 C.推力球軸承 D.調(diào)心球軸承
A.12.7 B.6.35 C.3.175 D.1.58
A.1/2 B.1/3 C.1/4 D.1/6
A.50 B.100 C.150 D.80
A.20 B.18 C.16 D.15
A.3/4 B.1/2 C.1/3 D.1/4
A.8 B.4 C.6 D.2
A.抓斗自重 B.滑輪組倍率 C.物料性質(zhì) D.鋼絲繩
A.5 B.6 C.7 D.8
A.方向 B.壓力 C.流量 D.速度