根轨迹
参考答案：
开环传递函数中某一参数（一般为开环增益K）由0变化到∞时，其闭环特征根在s平面上的变化轨迹。
Usually John would be late for meetings. But this time, _____ to my surprise, he arrived on time. [ ]
A. little
B. much
C. ever
D. even
吴茱萸汤的主治病证中不包括（）
A.阳明寒呕
B.厥阴头痛
C.少阴下利
D.胃寒腹痛
E.阳微肢厥
