心电图示电轴左偏约为-60°,Ⅰ、Av1导联呈qR波型,Ⅱ、Ⅲ、AvF导联呈rS图型,QRS时限<0.12秒见于()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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