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用于预防和治疗特殊疾病的中药是E.

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利用吸声材料的吸声作用而消声的是(),这种消声器对高频和中频噪声的消声效果比较好。 A.共振性消声器 B.复合式消声器 C.抗性消声器 D.阻性消声器

Can we do our work betterwith __________ money and __________ people?[A]lesser;few[B]less;fewer[C]little:less[D]few;less

China did not take IMF advice.()A RightB WrongC Not mentioned

On the nineteenth floor,you can__________. [A]buy sports things[B]play ping-pong[C]play computer games

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