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病人，女性，76岁，因急性广泛前壁心肌梗死急诊入院。入院后经扩张冠状动脉抗凝治疗，目前胸痛缓解，病情已平稳，1小时前病人突感心悸、气短，不能平卧，咳粉红色泡沫痰。查体:BP 90/60mmHg,R 28次/分，神志清楚,坐位口唇发绀 ，两肺满布湿罗音及哮鸣音。该病人目前的心功能为IV级，病人的休息方式应该是
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Mr. Peterson:Hi, Betty. I’m Ralph Peterson. Nice to meet you again.Betty:Nice to meet you, Mr. Peterson. I’m so pleased you could come. Will you sit here, please?Mr. Peterson:Thank you, Betty. You know, my company recently wants to set 1 _________in our building.After reading your brochures, I’m very interested.Betty:Thank you very much! I’ll be very glad to hear your comments. Could you tell me your demand?Mr. Peterson:Our company was established last month. We need to set up a LAN through the2 _________.And the LAN can hold at least 50 computers working at the same time.Betty:No problem. I’m sure that We can provide the highest level of 3 _________.Mr. Peterson:How long would it take before I could see the plan?Betty:Generally, the time we take to complete the plan is 3-5 days.Mr. Peterson:That sounds very good. We want the network to be 4 _________and 5_________. What’smore, we quite hope thatthe LAN has internal 6_________.Betty:OK, I see. Mr. Peterson, here is my business card and a folder for you, whichincludes our company profile and a price list. I hope it will help you.Mr. Peterson:Thank you.Betty:If you have any questions please contact me. You will find my telephone numberand email addresson my card.Mr. Peterson:OK. I’d like to say goodbye to you now. Thank you for your time.Betty:I’m very glad to have met you, Mr. Peterson. Let’s keep in touch. Goodbye.
介绍一下何为接触器自锁？
直接启动的优点和不足？
全压起动：电动机在额定电压下起动称为全压起动，又称__________________
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