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??   2010-04-23 18:11   ??2????   ???,,   ?  

???   2010-04-23 18:20 ???????QRS???????P--R????

???   2010-04-23 18:41 ????,?,...

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      ?????,P-R ??0.24s,??0.65%~1.1%,50 ??1.3%.
 ?,?????8.7%.???,?,?,,????,??,??P-R ?.
??P-R ????,??.?.
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