单项选择题
A.≥80% B.≥85% C.≥90% D.≥95%
A.70% B.80% C.90% D.100%
A.20-50mm B.20-70mm C.50-80mm D.50-100mm
A.0.2m B.0.3m C.0.4m D.0.5m
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