在体操比赛中,运动员在上单杠之前要在手上抹一些镁粉,而在杠上

在体操比赛中,运动员在上单杠之前要在手上抹一些镁粉,而在杠上做回环动作时手握杠又不太紧,他这样做的目的是（）

A．前者是增大摩擦,后者是减小摩擦

B．前者是减小摩擦,后者是增大摩擦

C．两者都是增大摩擦

D．两者都是减小摩擦

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