肺炎链球菌性肺炎首选抗生素
A．卡那霉素B．红霉素C．青霉素D．庆大霉素E．林可霉素
参考答案：C
R1=6欧，R2=12欧，串联后接到12伏的电源上．求（1）1分钟电流通过R1做功多少？（2）相同时间内两个电阻所消耗的电能之比？
Compared with the other players on the team, that footballer was short. But his speed _______ his small size.
A．compensated for
B．headed for
C．applied for
D．pushed for
