临床急需10%葡萄糖注射液500ml。试问如果用50%葡萄糖注射液和5%葡萄糖注射液混合制成，各需要的体积是

A.50.6ml．450.4ml

B.53.6ml．446.4ml

C.55.6ml．444.4ml

D.58.6ml．441.4ml

E.60.6ml．439.4ml

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答案：C