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【单选题】
以下选项中可用作C语言合法用户标识符的是A.
-abc
B.
void
C.
_123
D.
2a
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【简答题】C Sports is not only physically challenging, but it can also mentally challenging. Criticism（批评）from coaches(trainers), parents, and other teammates, as well a s pressure to win can create too much an...
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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