Which of the following transport mechanisms is not rate limited by an intrinsic Vmax（Vmax–最大转运速度）?

Which of the following transport mechanisms is not rate limited by an intrinsic Vmax（Vmax–最大转运速度）?

A.Facilitated di?usion via carrier

B.Facilitated di?usion via channel

C.Primary active transport via pump

D.Secondary active transport via exchanger

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