多选40.化工自动化仪表按其功能不同,分为( )。
1)指出控制系统的类型,并画出它的方块图;
(2)确定出主、副被控变量。
(1)试设计罐顶氮气压力分程控制系统(画在题图上);
(2)选择两调节阀的气开气关属性,说明理由;
(3)确定压力控制器的正反作用。
名解11.灵敏度
名解12.传感器
名解13.分程控制
名解15.控制阀的流量特性
— Hey, Derek, which do you think is harder to learn, marketing or designing?
—
— Is it better to be physically attractive or intelligent?
— .
— Do you prefer a portable or a clumsy 3D printer?
— .
Sometimes buyers only purchase some , tangible or intangible.
You can have eggs or hard-boiled.
Goods are carried by several of transport--on road or rail, by sea or air.
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
— May I suggest the sales start on or about October 1?
— .
Prices may change quickly if supply or demand .
— I wonder whether I could accept this discount or not.
—
自动化仪表工程须连续投入运行( ),运行正常后方具备交接验收条件。
1)指出控制系统的类型,并画出它的方块图;
(2)确定出主、副被控变量。
(1)试设计罐顶氮气压力分程控制系统(画在题图上);
(2)选择两调节阀的气开气关属性,说明理由;
(3)确定压力控制器的正反作用。
名解11.灵敏度
名解12.传感器
名解13.分程控制
名解15.控制阀的流量特性
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