与β-内酰胺类抗生素合用的药物为
A．舒巴坦
B．克拉维酸
C．三唑巴坦钠
D．西司他丁
E．头霉素
参考答案：A,B,C
A．电阻A的阻值大于电阻B
B．电阻A的阻值小于电阻B
C．电压相同时，流过电阻A的电流强度较大
D．两电阻串联时，电阻A消耗的功率较小
—Are you happy to have the ________ summer holiday?
—Sure. We can relax ourselves and do many things we like.[ ]
A. two-months
B. two month
C. two months'
D. two month's
