单项选择题
A.1ml/(kg·h) B.2ml/(kg·h) C.3ml/(kg·h) D.4ml/(kg·h) E.5ml/(kg·h)
A.0.05×109/L B.0.5×109/L C.1.5×109/L D.3.0×109/L E.5.0×109/L
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