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机械控制换向阀按阀芯头部结构形式不同,可分为哪些类型?各有何特点?

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画出下列阀的图形符号:二位三通双气控加压换向阀、双电控二位五通先导式电磁换向阀、二位二通推拉式⼿动换向阀、梭阀(或门型)、二位三通延时阀、溢流式减压阀、单向顺序阀、排⽓节流阀。

Colors have long been associated with emotions and ourmoods. Consider, for example, (1) _______someone could be in a “black mood” or “tickled pink” or “green with envy”.

But, can you really psycho analyze people (2)______ on the color they choose?

Dr. Paul Golden, a behavioral psychologist, says yearsof research (3)________him to believe that colors can tell a lot about aperson.