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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.2. Switch between horizontal and vertical screensThe simple understanding is that photometry is in charge of the light and shade distribution of the whole photo, with the central focus on photometry and uniform light and shade of the photo. The spot metering is more suitable for shooting the actors on the stage, that is, taking the actors as metering spots, and the photos taken are based on the brightness of the actors, rather than the shady scenes around the actors.早晨的阳光很美好，但汤莉华却感到天突然阴了。邻居小希看到汤莉华的女婿与一个女孩亲热地走在街上，而这个女孩却不是汤莉华的女儿。这个偶然的发现不仅让汤莉华为女儿痛心，也勾起了自己的心痛，她想起若干年前丈夫的背叛。在那次伤害与耻辱之后，汤莉华独自带大女儿，她把女儿的名字改为“汤红”，希望从此与那个叫艾明言的人断绝一切关系……这里有最丰富多彩的小贱人们，有最意想不到的扎堆撕，甚至还有最臭不要脸的莲花贱，最重要的是，还有五花八门的王爷们，走过路过不要错过，总有一款适合你！三国争乱之春秋淹城凝聚了我国春秋时期的古典文化精髓，围绕淹城这座古城“三城三河”相套而成的城池建筑过程，以及春秋时期吴、楚、越三国争雄的战争环境，将一座古城的兴建化为一个美丽的传说。他努力将眼前少年跟小时候的玉米联系起来，首先是眼睛重叠。