下列哪些检查方法可用来确诊肺栓塞()
A.检查痰中是否有血
B.肺放射性核素灌注扫描
C.右心心血管造影
D.疼痛开始后24小时胸部摄X线片
E.血清酶检查
参考答案:B, D
---How long has the United Nations ________?
--- ______1945.
A.come into existence; In
B.been in existence; Since
C.been in existence; From
D.come into existence; For
下列哪种药材呈不规则棍棒状,常2~3个花序基部连生
A.金银花
B.丁香
C.菊花
D.辛夷
E.款冬花