货车用汽油机转速可高达()转/分。 A.2000 B.3000 C.4000 D.5 发布时间:2018-05-23 21:45 │ 来源:www.tikuol.com 题型:单项选择题 问题: 货车用汽油机转速可高达()转/分。A.2000B.3000C.4000D.5000
题型:单项选择题 —Did you visit the famous cultural relics last month?—No, we____ it, but we spent too much time shopping.A.could have visitedB.must have visitedC.can't have visitedD.shouldn't have visited 查看答案
题型:单项选择题 心电图Ⅱ导联中出现下列各项表现,最符合房性期前收缩的诊断为A.提前出现变形异位P波,P'-R间期0.16sB.提前出现倒置异位P波,P'-R间期0.10sC.QRS波之前隐约可见P波,P-R间期0.06sD.提前出现正常QRS波,其后可见倒置P波, R-P间期0.20sE.提前出现宽大畸形的QRS波 查看答案