闭环控制系统是根据()信号进行控制的。
参考答案:偏差
--It snowed heavily last night. Is ______here today?
---Yes,and ______of us was late for school this morning.
A.anyone; no one
B.anyone; none
C.everyone; nobody
D.everyone; none
长期发热的患者,诊断伤寒最可靠的依据是()
A.玫瑰疹
B.相对缓脉
C.肥达反应阳性
D.血嗜酸粒细胞消失
E.血培养阳性