单项选择题
A.45%~50%B.55%~60%C.65%~70%D.55%~80%
A.55%~65%B.45%~55%C.35%~45%D.75%~85%
A.维生素D3B.维生素KC.维生素AD.维生素B
A.0.9~1m/sB.0.5~0.6m/sC.0.7~0.8m/sD.0.4~0.5m/s
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