Each indoor fire alarm push-buttons shall be equipped with a break-glass push-button and an alarm bell.

每个室内火警按钮都应有一个？？按钮和一个警铃。

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Each indoor fire alarm push-buttons shall be equipped with a break-glass push-button and an alarm bell.

每个室内火警按钮都应有一个？？按钮和一个警铃。

youdao