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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PV cells Heat exchangers

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Naturally,______facilitatesfriendships:thepeoplewelivenearorinteractwithfrequentlyaremorelikelytobecomeourfrie

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MacArthurandWilsonsuggestedthatthebiodiversityofanislandwillvaryindirectproportiontoafunctionoftheisland’ss

Theastronauts(chosenfor)fly(thefirst)UnitedStatesspacecraft.(were)selected(from)militarytestpilots.

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Henever(i)thewisdomIhadclaimedforhim,andmyfriendsquicklydismissedmyestimateofhisabilityas(ii).