通风工程检测、调试简要说明中,风机风压、风量测定时,系统阀门、风口全开,三通调节阀处于中间位置,此时管网阻力最大,风量最小。()
参考答案:错
Now many Chinese farmers like travelling from one place to to enjoy the beautiful scenery of our country.
A.other
B.others
C.the others
D.another
执行元件功用是执行()的指令,控制()的开度。