单项选择题
A.8mm B.10mm C.12mm D.14mm E.15mm以上
A.≥3mm B.≥4mm C.≥5mm D.≥6mm E.≥7mm
A.1/2 B.1/3 C.1/4 D.1/5 E.视情况而定
A.1:2 B.1:4 C.1:6 D.1:8 E.1:1
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