双向互动服务门户的总体架构主要包括（）层次。 A.展现层 B.控_爱下问搜题

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问题多项选择题

双向互动服务门户的总体架构主要包括（）层次。

A.展现层

B.控制层

C.业务逻辑层

D.持久层

答案

参考答案：A, B, C, D

单项选择题

以磷脂、胆固醇为膜材制成的剂型是

A．微囊

B．毫微囊

C．超微囊

D．脂质体

E．磁性微球

选择题

The weather turned out to be fine yesterday. I _____ the trouble to carry my umbrella with me.[ ]

A. should have taken

B. could have taken

C. needn't have taken

D. couldn't have taken