反映模拟的不足之处的表述是
A.模拟是不精确的,它既不是一个最优化过程,也不能得到一个答案
B.实际观察一个系统可能费用过于昂贵
C.不可能有足够的时间来实际广泛地操作该系统
D.由于难于观察到实际环境,模拟可能是惟一可以利用的方法
正确答案是A
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