【单选题】【消耗次数：1】
定义带参数的宏计算两个表达式的乘积，下列定义中哪个是正确的（）。
①
#definemuit（u，v）u*v
②
#definemuit（u，v）u*v；
③
#definemuit（u，v）（u）*（v）
④
#definemuit（u，v）=（u）*（v）
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