导管内 * * 状瘤
A．老年人B．青壮年C．2岁以内小儿D．3岁以上儿童E．新生儿
参考答案：A
I _______ Beijing in a few days. Do you know when the earliest plane ________?
A．leaves; takes off
B．is leaving off; is taking off
C．am leaving for; takes off
D．leave; is taking off
能迅速中和胃中过剩的胃液，减轻疼痛，但作用时间较短的药物是（）
A.雷尼替丁
B.碳酸氢钠
C.普鲁卡因
D.庆大霉素
E.氧化镁
