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Analysis: It mainly lies in retaining the plus and minus signs. The result is NaN, but note that NaN is not equal to all values, including itself.略微的思索之后，项羽立即明白了其中深意，点头道：亚父此计甚妙，可谓一石数鸟，不过最主要的还是针对尹旭和英布吧。(a) to obtain the second-level qualification of fire fighting facilities maintenance and testing institutions for more than three years, and there is no record of illegal practice in the three years prior to the date of application;When setting up the network, the network cable has to pass the test of "nine bends and eighteen bends". Therefore, when we choose the network cable, we should choose the network cable as soft as possible, and will not break it by folding it casually. Generally speaking, as long as the network cable meets the standard, the flexibility of the network cable can meet the requirements of wiring. That is to say, under the protection of the outer skin, the network cable will not break so easily, and it can also bear certain pulling force.In the end, it cost much more than buying high-quality products. Many of the poor's money is spent on such iceberg costs. It is often a waste of money to only think about saving money. Don't eat big losses because you are greedy for small gains.这下，连堂下站的黑汉子都气歪了嘴，对书生望着。