单项选择题
A.10%B.15%C.20%D.25%
A.压缩高/原始高B.(原始高-压缩高)/原始高C.恢复高/原始高D.未恢复高/原始高
A.10minB.30minC.1hD.2h
A.1B.2C.6D.25
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