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清醒病人，非腐蚀性药物中毒时可先用棉签或压舌板刺激咽喉壁催吐。()

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Backpacks with wide， padded straps and a belt can help to avoid problems of sprains and strains. 查看材料

A. Right
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Children should put all the books in their locker. 查看材料

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Roller bags tend to be heavier than ordinary backpacks.

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