介入放射学常用的血管收缩类药物包括()
A．肾上腺素
B．前列腺素
C．加压素
D．妥拉苏林
E．血管紧张素
参考答案：A, C, E
Bruce _________his leg when he _____ in a football match yesterday afternoon.
A．broke; played
B．has broken; was playing
C．broke; was playing
D．was breaking; played
关于先天性梅毒牙不正确的描述是（）。
A．牙冠形成期梅毒螺旋体侵入牙囊所致
B．牙 * * 增生突入成釉器
C．牙囊慢性炎症及纤维化
D．釉质表面成不规则小结节和坑窝
E．易受累
易受累