【判断题】开式齿轮传动的主要失效形式是:齿根弯曲疲劳折断,齿面的磨粒磨损。因此对应的设计原则是:按齿根弯曲疲劳强度设计计算,再适当增大模数以考虑齿面磨粒磨损的影响。
【单选题】—I’m surprised more and more people________participate in the morning exercises in the plaza now. —Morning is a time of day.
【判断题】不论何种格式的利润表都是用收入减费用计算利润。
【简答题】设计开式齿轮传动时,应先按齿根弯曲疲劳强度进行计算,确定模数,然后考虑磨损因素,将模数增大10~20,无需校核(__);
【简答题】Now more and more people may experience excessive (more than normal) hair loss(掉发). Hair loss of this type can affect men ,women and Children. But what causes excessive hair loss? A number of things c...