单项选择题
A.25HRCB.251HBC.20HRCD.241HB
A.0.50%B.0.60%C.0.70%D.0.80%
A.10%-90%B.10%-80%C.20%-80%D.20%-90%
A.1.7B.1.8C.1.75D.1.6
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