常用的膜分离组件有哪些类型？请画出四种市售膜分离装置结构示意图。
参考答案：
管式膜组件、平板式膜组件、中空纤维式膜组件、螺旋卷式膜组件
―Why didn't you go to the party last night?
―Because I _______. [ ]
A. wasn't invited
B. didn't invite
C. haven't invited
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