单项选择题
A.10*10 B.12*12 C.15*15 D.20*20
A.0.6 B.0.8 C.1 D.1.2
A.1 B.3 C.5 D.7
A.H1≥3mm B.H1≥5mm C.H1≥7mm D.H1≥10mm
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