对革兰阳性菌作用强,对革兰阴性菌作用弱的药物是()
A.第一代头孢菌素
B.第二代头孢菌素
C.第三代头孢菌素
D.第四代头孢菌素
E.碳青霉烯类抗生素
参考答案:A
兼有免疫原性及免疫反应性的抗原物质称为()
A.简单半抗原
B.复合抗原
C.阻断抗原
D.完全抗原
E.封闭抗原
When oil is accidentally discharged into the water,what should you do after reporting the discharge().
A.Contain the oil and remove as much of it as possible from the water
B.Throw chemical agents on the water to disperse the oil
C.Throw sand on the water to sink the oil
D.Obtain your permit from the Corps of Engineers