单项选择题
A.无裂纹 B.无裂缝 C.无渗漏 D.无脆裂
A.100×25 B.100×50 C.125×50 D.125×25
A.5 B.120 C.168 D.180
A.60±5 B.55±5 C.75±5 D.65±5
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