An expert system has as its base the collected knowledge of experts,the rules that experts use to arrive at decision.It（ ）,emulates the knowledge and thinking processes of human experts.A.by chanceB.so farC.in essenceD.in addition
An expert system has as its base the collected knowledge of experts,the rules that experts use to arrive at decision.It（ ）,emulates the knowledge and thinking processes of human experts.
A.by chance
B.so far
C.in essence
D.in addition
B.so far
C.in essence
D.in addition
参考解析
解析：in essence“在本质上”。A.by chance“偶然”；B.so far“迄今为止”；D.in addition“此外”。
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