单项选择题
下竹钉时根据自然裂缝的具体长度,竹钉间距每()下一枚竹钉。
A.50mm ±20mm
B.100mm ±20mm
C.150mm ±20mm
D.200mm ±20mm
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单项选择题
A.50mm ±20mm
B.100mm ±20mm
C.150mm ±20mm
D.200mm ±20mm
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