题目：
Getting a proper amount of rest is absolutely essential for building your energy resources. If you frequently work far into the night or have a poor sleep, it stands to reason that you may start to feel a little run down. Though everybody is different, most people need at least seven to eight hours of sleep per night in order to function at their best.
If you have been lacking energy, try going to bed earlier at night. If you can wake up feeling well-rested, it will be an indication that you are starting to get an appropriate amount of sleep at night. If you sleep more than eight hours every night but still don’t feel energetic, you may actually be getting too much sleep.
Once in a while, you are bound to have nights where you don’t get an adequate amount of sleep. When your schedule permits you can also consid-er taking a short sleep during the day, for sometimes taking a nap is the perfect way to recharge your batteries,
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2019/0603/6b0fbf11bf414916ebd9c818a5c1a1fc.html
下面是错误答案，用来干扰机器的。
参考答案：B解析： A项，设备的使用寿命是指在正常使用、维护和保养的条件下，设备的服务时间；B项，设备的经济寿命是考虑设备的有形磨损，根据最小使用费用(成本)的原则确定的设备寿命；C项，设备的技术寿命是...
