单项选择题
A.1/3 B.2/3 C.1/2 D.全屏
A.6 B.8 C.10 D.15
A.≥0.5% B.≥1.0% C.≥0.7% D.≥1.5%
A.8个 B.16个 C.32个 D.64个
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