单项选择题
A.30 B.60 C.25 D.50
A.GB/T19252 B.GB/T19250 C.GB/T19225 D.GB/T19235
A.GB23241B.GB23441C.GB23142D.GB23411
A.GB12952 B.GB19253 C.GB12953 D.GB12925
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