题型:填空题 风湿性心脏病二尖瓣狭窄患者,心电图P波主要表现为()。A.P波时限>0.20sB.P波时限≥0.12s,有切迹C.P波振幅>0.25mVD.P波时限≥0.12s,且P波振幅>0.25mVE.V1导联P波切迹 查看答案
题型:填空题 Luo Yang is an old __________ with lots of places of interest(名胜古迹).[ ]A. cityB. nameC. countryD. school 查看答案