哪些加工装配问题,会成为裂纹源或增大叶轮键槽应力?
参考答案:
键槽根部的倒角不足,光洁度不够,有加工刀痕,键顶无间隙,叶轮实际套装过盈量过大,均可成为裂纹源或增大键槽应力。
Look! Every player in our team is doing their best. It seems our team is going to win.
A.even if
B.if only
C.as if
D.only if
生后4天女婴,来自山区,因1天来拒奶,全身冰冷入院。查体:体温不升,反应差,皮肤呈暗红色,约30%皮肤如硬橡皮样。心音低钝,双肺呼吸音粗,腹尚软,脐带已脱落。该患儿皮肤硬肿最早可能出现在
A.会阴部B.臀部C.双肩胛区D.小腿外侧E.面颊