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单选题

To prevent damage to the engine, immediately install protective covers on all openings.

A为防止损坏发动机，立即打开所有安装的防护罩。

B为防止损坏发动机，稍候装上所有开口的防护罩。

C为防止损坏发动机，立即在所有开口上安装防护罩。

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正确答案：A （备注：此答案有误）

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