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All PCB requiring SMT processing must be provided with positioning holes. See the following figure for the size requirements of positioning holes:Zero inventory is one of the cores of JIT production mode. Only by ensuring "zero defects" can the goal of zero defects and zero inventory pursued by JIT production be realized. JIT production mode requires zero defects and zero inventory in all links of supply, production and marketing, which requires all links of production and operation to coordinate with each other, run smoothly and ensure high quality. Due to the close connection between various activities in the production process, the defects in a certain link will cause chaos in production, cause chain reactions, and cause the collapse of the timely production system, with incalculable losses. Therefore, when an enterprise should implement JIT production, it should mobilize all employees to actively participate. From the selection of suppliers to the design of products, the determination of production processes, and the production and sales of products, quality management should be strengthened in all stages. Through the self-control of relevant personnel, defects should be eliminated in real time, thus realizing zero defects in the production and operation process.与怪兽们缠斗上百年的亚伯拉罕·范·海辛（吉姆·加菲根 Jim Gaffigan 配音），意图利用这次千载难逢的机会将死对头德古拉以及他的伙伴们一网打尽……因为在过去几年里经常处理奇怪案件，贝冢北署警察内海薰（柴崎幸 饰）被上层派往美国某个经常发生乱七八糟事件的城市研修一年。经草薙（北村一辉 饰）的推荐，毕业于帝都大学法学系的美女高才生岸谷美砂（吉高由里子 饰）调来接替内海的位置。美砂正义感十足，虽然是一个没有任何功绩的新人警察，其为人却高度自信，言语刻薄，令常人难以接受。适值此时，新兴宗教团体苦爱会教主连崎至光（大泽隆夫 饰）念力杀人的案件发生，促使美砂找到帝都大学的物理学教授汤川学（福山雅治 饰）帮忙。坚信“万事皆有因”的汤川大展身手，圆满找出此案背后的秘密。美砂虽然不满汤川的态度，但是接下来一系列奇怪案件，仍将这个高傲的女孩和神探伽利略紧紧联系在一起。最新的组合，再次启程……郑氏喊苞谷道：来，给小七赔礼，说‘对不住，帮小七摸摸。第四季最后一集《A is for Answers》中，几位少女一路追踪，找到了爱丽森在费城的藏身之所，她们向她坦白，认为她的母亲就是在莫娜卸下神秘人“A”身份后继续折磨她们的继任者。对于这一切爱丽森似乎并不特别意外，只是说局面太过复杂，并向她的伙伴吐露了内心的秘密。