所有牙面发育点隙裂沟的龋损所制备的窝洞为
A．Ⅰ类洞B．Ⅱ类洞C．Ⅲ类洞D．Ⅴ类洞E．Ⅳ类洞
参考答案：A
You will see the products of Liu Ling alcohol________on every avenue of Baoding city.
A． advertise
B． advertising
C． advertised
D． having advertised
用于表面麻醉时，作用较强的药物是（）
A.左布比卡因
B.利多卡因
C.丁卡因
D.普鲁卡因
E.地佐辛
