以下哪种心律失常病人听诊时心律绝对规则（）
A.阵发性室上性心动过速
B.心房颤动
C.心房扑动
D.期前收缩
E.二度Ⅰ型房室传导阻滞
参考答案：A
FMS主要由（）物料运储系统以及计算机控制系统组成
The train fare is 56 yuan, the taxi fare is 88 yuan, and the bus fare is 22 yuan, so the____ way is by bus. [ ]
A. cheap
B. expensive
C. most expensive
D. cheapest
