单项选择题
A.7d B.10d C.5d D.30d
A.边长约80mm，厚度4mm～5mm B.边长或直径约100mm，厚度4mm～5mm C.边长或直径约80mm，厚度约4mm D.直径约80mm，厚度≥2.5mm
A.52.5R B.42.5 C.62.5 D.62.5R
A.0.500 B.0.505 C.0.525 D.0.530
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