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单项选择题

砌体墙面线管暗埋开槽，每个线管为一个测区，开槽尺寸合格标准为（）

A.砌体墙槽深度大于等于ｄｎ＋20mm，墙槽宽度≤ｄｎ＋30mm
B．砌体墙槽深度大于等于ｄｎ＋30mm，墙槽宽度≤ｄｎ＋30mm
C．砌体墙槽深度大于等于ｄｎ＋20mm，墙槽宽度≤ｄｎ＋20mm
D．砌体墙槽深度大于等于ｄｎ＋30mm，墙槽宽度≤ｄｎ＋20mm
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A.”
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