不符合心房扑动的诊断条件的是
A．QRS波群时限增宽B．可见F波C．心房率250～350/minD．有固定的房室传导比例E．P波的消失
参考答案：A
Everyone knows that________ is dangerous to play with fire, but________ is difficult is to prevent children from playing with fire.
A．it; what
B．what; what
C．what; it
D．it; it
表示减毒配伍关系的是（）。
A.相须、相使
B.相须、相畏
C.相畏、相杀
D.相杀、相恶
E.相恶、相反
