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3. Some types, such as the core trading engine of the exchange, control the trading process. If multiple types can be created, the system will be completely chaotic. (For example, if there are multiple commanders in an army who command at the same time, there will definitely be a mess), so only by using the singleton mode can the core transaction server independently control the whole process. The following is an analysis of some examples that we need to pay attention to when applying singleton pattern in the development process.Compared with the distributed denial of service attack that directly forges the source address, the reflection attack is more difficult to trace the source of the attack due to the addition of a reflection step. However, this is not the real threat of the reflection attack, and the real threat lies in the amplification attack using the reflection principle.If there is a problem with MDT conference facilities, especially the network signal connection problem, the IT staff of the hospital should give timely help so as not to affect the making of diagnosis and treatment decisions.　　本剧为《毛骗》番外篇。时隔7年，《Code Blue》系列再次回归，定档2017年暑期档。新垣结衣、山下智久、比嘉爱未、户田惠梨香、浅利阳介等原班人马将再次齐聚，本季度也将延续此剧的主题，继续为我们展现冲在救援最前线的直升机急救员们的工作、生活历程。 　　以直升机急救员为主题的电视剧非常少，本剧 的第一季已经播出就在日本引起了很大的社会效应。“直升机急救医院网”（HEM - Net）会长国松孝次表示，《Code Blue》使更多人知道了直升机急救员的存在，生动展现了医生和护士们奋战在生死一线的画面。2007年当时全国的急救直升机只有14架，而截至今年3月达到了50架，基本可以覆盖日本全国，这其中也一定有本剧的功劳。This time, the handwriting of the interface is undoubtedly one of the most striking events in the industry this year. Many people's circle of friends has been swept by the incident. In the media group, the winners of the award, such as interface reporter Liu Xiangnan, have received congratulations and it is estimated that many red envelopes have also been given.