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Chapter II Qualification ConditionsTime 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.4? Distributed attack19世纪70年代，两名来自不同阶级的足球运动员努力应对职业和个人双重困境——他们不仅改写了足球史，也永远改变了英格兰。　　面对来自恐怖分子的威胁，李警官和卡特再次联手共同作战。在既无恐怖份子下落也不知炸弹藏在何处的情况下，他们一面要争取时间尽快抓到潜伏在香港的恐怖份子，一面要尽快找炸弹的安放位置以便及时解除炸弹威胁。然而由唐·奇德尔、尊龙以及章子怡饰演的恐怖份子却十分狡猾，在目的没有达到的情况下，他们一点点地在拖延时间。眼看上下班的交通高峰期即将来临，正所谓魔高一尺道高一丈，李警官和卡特这对黄金组合在关键时刻抓住了狐狸尾巴，将恐怖分子　　郭一要求卓颖在一天之内训练母亲成一个合格的乒乓球手，以此要卓颖冲破难关。卓颖为求归队，毅然接受这个近乎不可能的任务…借着乒乓的魅力，卓颖逐渐拉近母女的距离。更明白教练与母亲，是支持自己最强大的后盾。