单项选择题
A.4φ6 B.4φ10 C.4φ12 D.4φ16
A.l/2 B.1/3 C.1/4 D.1/5
A.5mm B.5~l5mm C.20~30mm D.50mm
A.砂浆稠度过大 B.砖尺寸不标准 C.轴线不准 D.未双面挂线
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