答案:__________

答案:__________

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The ratio of the work done by the machine __________ the wor

The ratio of the work done by the machine __________ the work done on it is call

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根据以下材料回答:答案:__________

根据以下材料回答:答案:__________

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We are looking forward to (receive) __________ your letter a

We are looking forward to (receive) __________ your letter again.

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Motor cyclists should wear helmets to shield them from injur

Motor cyclists should wear helmets to shield them from injury.A)摩托车手应戴上头盔,以掩盖他们免

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