PV cells Heat exchangers

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问题 PV cells
Heat exchangers

选项 A、recover up to 90% of heat that would otherwise be lost.
B、recover over 90% of heat that would otherwise be lost.
C、are difficult to use.

答案A

解析

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雅思听力

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PV cells Heat exchangers

雅思听力

雅思（IELTS）

Commentatorssuggestedthatmanystudentsofthe1950swere______radicalpoliticsbecausetheysawnothinginAmericanlifeagai

Afteryearsoftakingarthistorycoursesandvisitingmuseums,Edconsideredhimselfatrue______offineart.

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