单项选择题
A.0.2%B.0.3%C.0.4%D.0.5%
A.12hB.24hC.48hD.72h
A.B<9mB.9m ≤B<14mC.14m ≤B<18mD.B≥18m
A.±50mmB.±70mmC.±90mmD.±100mm
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