调节器和调节对象相互作用所形成的闭合回路称为()。
参考答案:自动调节系统
Being honest ______ not get you a lot of friends, but it _______ always get you the right ones.
A.can; must
B.may; will
C.can; will
D.may; must
室内民用燃气管道通常采取引入管为沿墙明敷设;户内管道为直接埋地敷设。( )