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    33．UNR is a very engine –– it recharges its own battery while it’s running. A．flexible B．permanent C．delicate D．efficient 【查看更多】

     

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    UNR is a very _______ engine―it recharges its own battery while it's running.

    A. flexible    B. permanent    C. dehcate D. efficient

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    UNR is a very ________ engine –– it recharges its own battery while it’s running.

    A．flexible              B．permanent           C．delicate              D．efficient 

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