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第56题、Why are you advised to write down the error message as much as possible? To find out if other people are having the_____________________________.
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第57题、What should you do when you have trouble with a specific piece of computer hardware? To check all_____________________________.
第58题、When should you restart your computer? When_____________________________.
第59题、What can you do if you need additional help? You can_____________________________the writer.
甲乙双方订立买卖合同，甲为出卖人，乙为买受人，约定收货后10日内付款。甲在交货前有确切证据证明乙经营状况严重恶化，根据法律规定，甲可采取的措施是（）。
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