【简答题】Everyone should work hard more and succeed but it is not wise to get success at the cost of family and health. There was once a hard-working father. He tried his best to support his wife and three chi...
【单选题】They made a great effort to prepare the exhibition, ______ to achieve a big success.
【判断题】行程速比系数K>1的连杆机构具有急回特性。()
【简答题】平面连杆机构当行程速比()时,机构就具有急回特性。