再障危象
参考答案：
再障危象是由于某种原因所致的骨髓造血功能急性停滞，血中红细胞及网织红细胞减少或全血细胞减少。可在短期内恢复。
A man may usually be known by the books he reads ____ by the friends he keeps.
[ ]
A. rather than
B. as well as
C. in place of
D. as many as
室上速伴差异性传导的诊断有（）
A.易发生室内差异性传导
B.P波与QRS波群相关
C.每次心动过速均由期前发生的P波开始
D.心室夺获
E.刺激迷走神经可减慢或终止心动过速
