分离培养脑膜炎奈瑟菌选用
A．血平板 B．沙保培养基 C．巧克力色培养基 D．罗氏培养基 E．疱肉培养基
参考答案：C
In the last few years, great changes _____ in China.[ ]
A. were happened
B. have been happened
C. have happened
销售价格管理中的价控有哪几种？（）
A.仓库
B.客户
C.客户类别
D.业务员
