以下 4 组用户定义标识符中，全部合法的一组是
A.)_total clu_1 sum
B.if -max turb
C.txt REAL 3COM
D.int k_2 _001
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正确答案： A 答案分析：无
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A.)_total clu_1 sum
B.if -max turb
C.txt REAL 3COM
D.int k_2 _001
A.)_total clu_1 sum
B.if -max turb
C.txt REAL 3COM
D.int k_2 _001
A.)_total clu_1 sum
B.if -max turb
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B.if -max turb
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D.int k_2 _001
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B.if -max turb
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D.int k_2 _001
A.)_total clu_1 sum
B.if -max turb
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D.int k_2 _001
A.)_total clu_1 sum
B.if -max turb
C.txt REAL 3COM
D.int k_2 _001
A.)_total clu_1 sum
B.if -max turb
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D.int k_2 _001
A.)_total clu_1 sum
B.if -max turb
C.txt REAL 3COM
D.int k_2 _001
