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【单选题】
有如下的说明和定义 则以下叙述中正确的是A.
（P++）->a与P++->a都是合语法的表达式，但二者不等价
B.
语句++P->a；的效果是使P增1
C.
语句++P->a；的效果是使成员a增1
D.
语句′P->s++；等价于（*P）->s++；
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