【单选题】如图所示平面机构中,杆 AB 以不变的速度 v= 1m/s 沿水平方向运动,套筒 B 与杆 AB 的端点铰接,并套在绕 O 轴转动的杆 OC 上,可沿该杆滑动。已知 AB 和 OE 两平行线间的垂直距离为 b =1m 。求在图示位置( γ = 60 °, β =30 °, OD = BD )时,杆 OC 的角速度和角加速度、滑块 E 的速度和加速度。
【简答题】Section A Pasta is no longer off the menu, after a new review of studies suggested that the carbohydrate can form part of a healthy diet, and even help people lose weight. For years, nutritionists hav...
【单选题】A domestic appliance retailer maintains a central warehouse from which the outlets are supplied. The following information is available for part SF525. Average sales 75 per day Maxim...