隐匿性旁路是指()。
A.QRS起始部无预激波
B.PR间期<0.12秒
C.房室旁路仅有前向传导功能
D.房室旁路仅有逆向传导功能
E.既可前向传导,又可逆向传导
参考答案:D
–______will you stay here for the meeting?
–Until the day after tomorrow.
A. How long B. How often C. How much
牛奶加工均质工艺实际上是降低脂肪球直径,其目的在于防止牛奶在保质期内脂肪上浮。