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In web development, Picture preloading is a common technique, If you set the src attribute directly to the img tag node, If the picture is larger, Or if the network speed is relatively slow, Before the picture is loaded, The picture will be a blank scene for a period of time. This is not good for the user experience, so at this time we can use a loading loading picture as a placeholder to prompt the user that the picture is being loaded before the picture is loaded. After the picture is loaded, we can directly assign a value to the picture. The following code is as follows when we do not use proxy mode to preload pictures:In the case of a reflection attack, An attacker uses a controlled host to send a large number of packets, The special feature of these packets is that the destination IP address points to the server, router and other devices as the reflector, while the source IP address is forged as the IP address of the target. When the reflector receives the packet, it will think that the packet is a request sent by the attacked bird, so it will send the corresponding data to the target.白鹭，在传说中是天使的化身，栖息地在美丽的海滨城市一厦门。本片以全新的视角，日记的形式，一页页掀开同样有着天使称号的以厦门白鹭航空公司为代表的空姐们的神秘面纱，通过讲述空姐们麻雀变凤凰般的蜕变历程，呈现出一个神秘光环笼罩下的真实世界。故事舞台设定在与现实有微妙差异的现代日本，这个世界因为德累斯顿石板的存在而产生了强大的能力者，出现七位强大的王权者。作品主要描绘了异能者之间的战斗、七位王权者各自的执著以及被卷入其中的少年“小白”的命运。1. Ships of 12m or more in length shall be equipped with a horn, and ships of 20m or more in length shall be equipped with a bell in addition to the horn. Ships with a length of 100m or more shall be equipped with a horn in addition to the horn and bell. The tone and sound of the gong must not be confused with that of the bell. The horn, bell and gong shall conform to the specifications set out in Appendix 3 to these Rules. The bell, gong or both can be replaced by other equipment with the same sound characteristics as their respective, but it is required to manually sound the specified signals at all times.