确认在该电话簿中有没有错误的电话号码，以及有没有两个(或两个以上的)商业单位使用相同的电话号码。由于当地只使用了 3 和 6 两个区段，因此电话号码的第一个数字应当永远是 3 或者 6，如果出现了其它数字，就表示这个电话号码错了。此外，如果电话号码中出现了 Q 和 Z，也说明这个电话错了-Confirmed in the phone book there are no wrong telephone numbers, and there are no two (or more) commercial units use the same phone number. Since the local had only been used for the two sections 3 and 6, so the telephone number of the first number should always be 3 or 6, if there is other figures, said the phone number wrong. In addition, if the phone number appeared in the Q and Z, also shows that this phone is wrong