______________, I can't do it for you. [ ]
A. Excuse
B. Sorry
C. Excuse me
答案：B
与十进制数291等值的十六进制数为
A．123
B．213
C．231
D．132
磺胺增效剂药物是
A．磺胺嘧啶B．甲硝唑C．甲氧苄啶D．诺氟沙星E．黄胺米隆
