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账簿中的每一账页就是账户的存在形式和载体，没有账簿，账户就无法保存。
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设n阶矩阵A的伴随矩阵A*≠O，若ξ1，ξ2，ξ3，ξ4是非齐次线性方程组Aχ＝b的互不相等的解，则对应的齐次线性方程组Aχ＝0的基础解系 【 】
Benefits of Face-to-Face Communication Face-to-face communication is the first basic communication method. In the era of information technology, people are now faced with a myriad of communication options. Be it letters, emails, or telephone conversations, none is more effective than face-to-face interaction, because it helps the speaker to convey a complete message, obtain immediate feedback, and build trusting relationship. ______________________________________________________ In addition, face-to-face communication provides immediate feedback. If the message is ambiguous, the speaker can clarify it right away. The listener can raise questions if he feels confused. Hence, the speaker can detect and prevent possible misunderstandings or confusion among the listeners. Since all the people involved in the interactive process can easily see each other, their approval, interest, or disregard can easily be deduced and dealt with. Renowned CEOs, like Bill Gates, attach much importance to face-to-face communication and highly appreciate the timely responses of the staff at business meetings. Lastly, face-to-face communication enhances the relationship between people. It’s difficult to build rapport only over emails or through phone calls. It seems that people tend to depend less and less on face-to-face talks to express their gratitude and appreciation, but this form of contact is extremely important for establishing trusting relationship. As an office worker, what would you feel when your colleagues come up to your desk and congratulate you on the great report you sent or the presentation you made recently If a team leader calls his team members to the office just to say "thanks" and pat their backs, the team will be sure to take a liking to him immediately. Even in the modern world full of electronic communication devices, face-to-face communication remains the most Powerful human interaction. Without face-to-face communication, information recipients have to interpret an incomplete message, because much of the information gained in communication is derived from non-verbal cues. They have no chance to question the speaker or clarify the information. Moreover, they are unlikely to feel warmth from or build trust on the message deliverer. Therefore, face-to-face interaction cannot be replaced by other forms of communication.
单位购人甲材料48000元，货款以银行存款支付40000元，其余8000元暂欠，该笔业务应编一张转账凭证。
设A为m×n矩阵，则齐次线性方程组Aχ＝0仅有零解的充要条件是A的 【 】
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