单项选择题
A.50%+/-5% B.60%+/-5% C.70%+/-5% D.80%+/-5%
A.0.2%~0.5% B.0.4%~0.8% C.0.5%~1% D.0.8%~1.2%
A.略深 B.略浅 C.相同 D.可深可浅
A.大于80% B.小于80% C.小于60% D.大于60%
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