若a<b,c≠0,则ac2______bc2.
∵a<b,c≠0
∴c2>0
∴ac2<bc2.
治疗葡萄球菌肺炎的首选抗生素是
A.苯唑西林
B.哌拉西林
C.链霉素
D.阿米卡星
E.氯霉素
Please show the tickets _____ me. [ ]
A. on
B. at
C. to
D. with