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The utility model is a safety device, which has the functions of self closing and emergency escape.
它是一种安全设施,具有自闭功能和紧急逃生功能。
youdao
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The utility model is a safety device, which has the functions of self closing and emergency escape.
它是一种安全设施,具有自闭功能和紧急逃生功能。
youdao