多项选择题

下述哪些方法有助于口令安全（）。

A.口令／帐号加密
B.定期更换口令
C.限制对口令文件的访问
D.设置复杂的、具有一定位数的口令

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不定项选择

‎可口可乐是软饮市场的补缺者。‌

A．正确
B．错误

单项选择题

Which statement is NOT correct? A.
Please go with the tour group to the airport and on arrival. B.
After all the check-in procedures have been done, accompany with the group the security, and bidding farewell with the group again. C.
You need to confirm with the hotel that a wake-up call will be arranged. D.
You need tell the group to buy some food for their breakfast, if you would be leaving before hotel's working hour.