问答题下面哪一些是合法的C++标识符？ extern，_book，Car，car_1，ca1r，1car，friend，car1_Car，Car_Type，No.1，123
问答题
下面哪一些是合法的C++标识符？ extern，_book，Car，car_1，ca1r，1car，friend，car1_Car，Car_Type，No.1，123
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