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NPN型三极管工作在放大时，电压、电流满足什么？
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三极管在直流偏置应用电路中，可以构成哪几种电路？
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。
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)________ → __________ → _________ → __________
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