题型:名词解释 .Walking alone in the deserted village, John was scared. He thought he ______Tom to go with him.A.might have askedB.should askC.must have askedD.should have asked 查看答案
题型:名词解释 正常人心率超过180次/分时,引起心输出量减少的主要原因是()。A.心室充盈时间明显缩短,充盈量减少B.心室舒张期过长,心室充盈早已接近限度C.快速射血期缩短D.慢速射血期缩短E.迷走神经活动加强 查看答案