所谓松弛法，实质上是()的一种加速方法。

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设Sum 与x均为变量，语句Sum=Sum+x含义是()。

A.将变量Sum 与x的值相加后赋给变量Sum
B.Sum 值等于Sum的值加x的值
C.A与B两选项均不对
D.A与B两选项均对

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