题目内容
示波器外部测试信号为直流信号，此时应在示波器内部设置耦合方式选择直流耦合。
查看答案
搜索结果不匹配？点我反馈
更多问题
示波器测试信号时，探头衰减倍数至“1X”，示波器内部设置此时至“10X”，测试结果可以算正确。
The following is a list of key points of a letter of complaint. Talk with your partner and put them in the right order.A. Your requirements: Do not forget that you write the letter for either changing the product or getting your money back. In each case, you need to make your requirements practical and reasonable. (赔偿要求，实际合理)B. Product description: A detailed description of the product or service you bought should be given. （产品描述，务必详细）C. Rights reserved: To avoid any purposeful delay by the opposite party, you may add a few lines to state your reserved rights for further action or punishment. (如不理会，保留权利)D. Problem description: A simple but clear description of the problems you have had with the use of the product or service is also important. (故障描述，简单明了)________ → __________ → _________ → __________
SampleFebruary 8, 2015Dear Mr. Palmer,Exactly one week ago, I purchased a Greco MP3 player, model A2348, from your store while I was on vacation in Astoria.Unfortunately, it does not work as intended. It starts up all right, but turns itself off after a few minutes. I am disappointed because I paid $55 for a product that clearly is defective (有缺陷的).I ask for a replacement. I am enclosing the player, along with the sales receipt. As I will pay to ship it to you, it would be fair for you to pay return postage (回程邮资).I am reluctant to make any formal complaint yet, as I think you will protect your store’s reputation by returning the product in time, say one week.Sincerely yours,Ryan WoodsEnclosures: Greco MP3 playerCopy of sales receiptTask:Give brief answers (in no more than 3 words) to the 5 questions that follow.1. What did Ryan Woods purchase while he was on vacation in Astoria?He purchased a __________________________________.2. What’s wrong with the MP3 player ?It starts up all right, but _______________________after a few minutes.3. Why is Ryan Woods disappointed?Because he paid ________ for a product that clearly is defective.4. What does Ryan Woods ask for?He asks for _____________________.5. What is Ryan Woods enclosing ?Ryan Woods is enclosing the player, along with ____________________.
When expressing thanks to a business client who has given you a gift, you should :_______.
微信支付 
支付宝支付