轴流风机喘振与旋转失速有关，喘振剧烈后会造成逆流.
参考答案：对
把下列句子中表示家庭成员的词找出来，写在后面的横线上。
1. This is my sister. _______________
2. My brother is tall. _______________
3. My father is a businessman. _______________
4. I love my grandma. _______________
5. My aunt is young. _______________
动作经济原则下的动作浪费有哪些？
