Unverified50% confidenceCautionTime unknown
门框式免打孔引体架依靠杠杆压力固定，仅适用于门框宽度72-90cm、且门框两侧墙体为实心砖混结构的门洞；空心砖、石膏板或包边木门框会因局部受压破损或整体滑脱
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