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Time relays are divided into two types: on-time delay type and off-time delay type, and their symbols are shown in the following figure. For the power-on delay type time relay, when the coil is powered on, the power-on delay type contact acts after the delay time (the normally closed contact is opened and the normally open contact is closed), and the contact immediately returns to normal after the coil is powered off; For the power-off delay type time relay, when the coil is powered on, the power-off delay type contact acts immediately (the normally closed contact is opened and the normally open contact is closed). After the coil is powered off, the contact will not return to normal until the delay time is passed.I. Collision Inspection of BIM Technology in Metro Station Comprehensive Pipelines黑道老大刘德华胆小如鼠，国际刑警谭咏麟装傻摆酷，胖墩曾志伟要被放血，只为争抢一个和尚，各路人马杀到新加坡，为救两条人命，好人坏人疲于奔命。新加坡国庆，达卡喇嘛到新访问，警方因人手不足，逐派探员石头(梁家仁)与国际刑警雷泰(谭咏麟) 合力保护达卡。可惜，在警方严密保护下，达卡仍被赤军刺伤。香港黑道人物大B(刘德华)与女友阿玲(罗美薇)到新加坡旅游，在飞机上巧遇达卡，阿玲同时被刺伤。大B与石头、雷泰联手寻找罕有的P型血者抢救达卡与阿玲，十二小时内要有血到。但所有P型血者都被赤军杀死，最后的P型血者肥波(曾志伟)在惊险的途中...Pressure (kg/cm2)　　在1964至1974这社会动荡的10年里，阿里表现出的坚忍不拔的毅力和决不屈服的独立性不仅对他个人，对拳击界甚至对整个社会都产生了巨大的回响，阿里亦因此成为黑人运动和反越战运动的精神领袖。　　与此同时，人工智能中的邪恶力量也在觉醒，他们策划了一场恐怖绝伦的入侵阴谋，矛头直指那颗美丽的蓝色星球——人类的最后家园！危机四伏之际，最神秘的异星历险猝然开启，最疯狂的拯救行动也随之展开！为了生存，星际探险员们将作出怎样的艰难抉择？恩怨交织，流落荒芜星球的英雄们命运谁主沉浮？更有神秘红色精灵，光之星米瑞斯的归宿究竟在哪里？浩渺星系，机械迷城，深层宇宙空间里那些高度发达的人工智能，又隐藏了多少不为人知的秘密呢？