_________(61)A.change B.changingC.to change D.bei

_____ is the circulation and refreshing of the air in a space without necessarily a change

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The word "move" underlined in Paragraph 6 means to ______ .A．change position or placeB．tak

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The word "move" underlined in Paragraph 6 means to ______ .A．change position or placeB．tak

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The discharge head of a centrifugal pump will vary directly with the _____.A.change in imp

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_________(57)A.change B.hydrogen C.oxygen D.memory

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_________(61)A.change B.addC.switch D.shift

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55._________A.change B.obtain C.cause D.affect

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