放射性核素脑灌注显像时使用过氯酸钾最主要的目的是()。
A.增加脑血流量
B.减少胃粘膜的摄取
C.封闭脉络丛
D.减少甲状腺摄取
E.封闭甲状腺
参考答案:C
—Jack, this is the third time that you have been late this week.
—Sorry, sir, but I was _____ for 15 minutes on the way.
A.held up
B.put up
C.taken up
D.given up
不是由于前负荷增加所致心力衰竭的疾病是()
A.肺动脉瓣狭窄
B.甲状腺功能亢进症
C.二尖瓣反流
D.室间隔缺损
E.动静脉瘘