在自动控制系统中大多是采用负反馈。
参考答案:对
消渴病,肾阴阳两虚证主方()
A.金匮肾气丸
B.二冬汤
C.六味地黄汤
D.玉女煎
E.消渴方
Bruce and his father are talking ________ the telephone.[ ]
A. on
B. with
C. from
D. in