风机的管路特性曲线qv-pc
参考答案:
风机管路系统中通过流体的体积流量与单位体积气体流过管路系统时所需要的能量之间的关系曲线。
More and more persons who use the Internet had created a () or web based diary.
A.blog
B.DBMS
C.profile
D.photo-set