具有速度变动率δ>0的调速系统，其静态特性曲线是一条（）
A.单调上升的直线
B.单调下降的直线
C.水平直线
D.垂直直线
参考答案：B
One of the important lessons children learn from their parents is ________
A．how speaking politely to others
B．how to speak politely to others
C．what time speaking politely to others
D．what time to speak politely to others
全身麻醉时的输血反应，下列哪项错误()
A．和清醒时相比较，全麻时较少出现输血反应
B．全麻时出现输血反应，常无寒战
C．全麻时输血反应的症状常不能感受及表述
D．全麻时输血反应多表现为荨麻疹及血压下降
E．全麻时输血反应与清醒时相同
