增强CT扫描可用()
A.马根维显
B.磁显葡胺
C.两者均可
D.两者均不可
参考答案:D
Steven is the ________ student in his class. He is good at all the lessons and ready to help others. [ ]
A. better
B. best
C. worse
D. worst
巴比妥类药物分子结构中因含有酰亚胺基团,因而可于碱性介质中加热水解,产生能使红色石蕊试纸变蓝的气体。该气体应为
A.乙二胺B.二氧化碳C.二乙胺基乙醇D.氨气E.乌洛托品