麻黄药材纵切面置紫外灯下观察可见( )
A.边缘亮白色荧光,中心亮棕色荧光B.不显荧光C.蓝色荧光D.金黄色荧光E.灰色荧光
参考答案:A
Over the years the European Union has made great efforts to _______ the safety of food and protect the health of its people.
A.discover
B.ensure
C.revise
D.react
物流企业采用把主要力量集中在某一特定市场或服务品种上的战略是()
A.低成本战略
B.差异化战略
C.重点战略
D.多样化发展战略