单项选择题
A.3‰ B.5‰ C.7‰ D.10‰
A.0.1% B.0.3% C.0.5% D.1%
A.110%，90% B.90%，110% C.130%，70% D.70%，130%
A.90%，90% B.90%，110% C.110%，90% D.110%，110%
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