单项选择题
A.0.01-0.02B.0.01-0.04C.0.01-0.06D.0.01-0.08
A.10~30m3/(m2•d)B.20~50m3/(m2•d)C.30~70m3/(m2•d)D.40~80m3/(m2•d)
A.10%~20%B.20%~30%C.25%~35%D.30%~40%
A.1%B.2%C.3%D.4%
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