管路系统的特性曲线是随着()的增加而上升。
A、流量
B、扬程
C、轴功率
D、效率
参考答案:A
— What’s the matter with you?
— Oh, once again I had my best friend ___, because the expression on his face ____ his anger.
A.hurting; betraying
B.to be hurt; to betrayed
C.hurt; betrayed
D.being hurt; betraying
轴流风机的工作原理是基于流体力学的()
A.升力原理
B.离心理论
C.平衡理论