單項(xiàng)選擇題腳手板對(duì)接平鋪時(shí),接頭必須支在兩根橫向水平桿,腳手板外伸長(zhǎng)應(yīng)?。ǎ?/strong>

A.100~130mm
B.130~150mm
C.150~200mm


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