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Some common behavior methods will be defined in the state class, and Context will eventually delegate the request to these methods of the state object. In this example, this method is buttonWasPressed. No matter how many state classes are added, they must implement the buttonWasPressed methodTime 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.葫芦出声问道：里面可有啥重要东西没？板栗想了想道：也没啥重要的东西，不过是些碎银两和一小瓶伤药。该剧是一部悬疑追踪惊悚剧，讲述曾从危机中解救了人类的神秘的存在，某一天突然出现并帮助杀 人魔，管理局的职员和警察执着揭发真相的故事。Color望向南方的湖面：那么宽，那么广，等到满湖都是青荷与菱叶，再点缀无数荷花的时候，该是接天莲叶无穷碧的画面了。东北大学抗日青年张北惨遭日寇灭门，他怀着一腔仇恨，欲单枪匹马与侵入中华国土的日寇做生死斗争。张北的女友、爱国青年赵微澜毅然投身共产党。身怀国仇家恨的张北与赵微澜不得不暂时分离。在孤身对日寇斗争的过程中，张北面对着金樱子的单恋、共患难的季娜和义妹花花之间或内疚、或感激、或温暖的情感，遭遇着重重险阻、屡屡受挫，幸得我党志士老铁、赵薇澜等人的数次救难和协助，得以脱离险境。在血与火的洗礼中，张北逐渐看到这些坚定的共产主义革命者身上的大义和无畏精神，开始反省自己一直坚守的独行狭义主义，终于接受我党在思想和精神上的召唤和指引。最终，张北在我党革命志士的帮助下，终完成一项项艰巨使命，并成长为一名坚强的共产主义战士。