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周菡又兴致勃勃地说道：这拔萝卜还不算有趣。在仅有一次的租赁中，有着闪耀光辉的真实！恋爱×心动MAX的冒失恋爱故事，揭幕！这是高见翔警官生命中最艰难的一天：母亲去世，工作遇阻，还在奔丧时意外撞死了一个人。他本以为可以瞒天过海，没想到一个惊天阴谋在前方等待，令他身陷迷局......郑氏无法，只得让人挑大些的螃蟹留下，让厨房用豆面裹了炸出来，其余的都送回河中去了。PS: Many forums have seen beginners ask whether WCF still needs to learn in depth, because they think these technologies may be outdated. Maybe Microsoft will launch a new SOA implementation scheme at that time. Wouldn't it be a waste of time to learn in depth, so they feel that there is no need to learn in depth and just know how to use them. I had the same feeling about this problem before, but now I think that although WCF technology may be replaced, the key to understanding a technology in depth is not to know some more advanced API calls, but to understand its implementation mechanism and way of thinking. Even if the latter technology is replaced, the mechanism behind it is definitely similar. Therefore, if you have a thorough understanding of a technology, you will feel familiar with the new technology and relaxed about it. In addition, after you have a thorough understanding of a technology, you dare to say that you have mastered the technology well during the interview, instead of saying that you use it a lot at ordinary times. Once you ask deeply, you do not know the implementation principle behind it. This is also why I want to write WCF series. I hope this opinion is helpful to some beginners.Time relay is a kind of delay control relay, which does not immediately let the contact move after obtaining the action signal, but delays for a period of time before letting the contact move. Time relays are mainly used in various automatic control systems and start-up control circuits.