连云港到广州的飞机票全价980元.李老师按六折购买了一张这样的机票,他省下了多少元?
980×(1-60%)
=980×40%
=392(元)
答:他省下了392元.
—I think classical music is pleasant.
—_____, I think it's boring. [ ]
A. I agree.
B. I think so.
C. I don't agree.
D. I don't know.
患者,男性,35岁。与朋友聚餐后突发上腹部剧烈疼痛,后转为右下腹并伴有固定压痛点,临床诊断为"急性阑尾炎",准备手术治疗。
急性阑尾炎腹痛起始于脐周或上腹的机制是()。
A.胃肠功能紊乱
B.内脏神经反射
C.躯体神经反射
D.阑尾位置不定
E.阑尾管壁痉挛