Basically, the eval_frame function looks at the current bytecode in an execution context, and switches control out to a function appropriate for implementing that bytecode.
eval _ frame函数主要察看执行上下文中的当前字节码，并将控制向外切换到一个适合实现该字节码的函数。
All kinds of function modules of pneumatic balance circuits have been designed such as air press regulation, loads switch, execution control, decompression protection and residual pressure exhaust.
根据气动平衡系统所需功能，设计了压力控制设定、载荷切换控制、执行控制、失压保护和残压释放等功能模块；
Slave computers have data detection and control function with the help of the data capture and control interfaces which are composed of all kinds of position switches, sensors and execution units.
以各种位置开关、传感器和执行元件为电站的数据采集和控制的接口，下位机具有数据检测和控制功能。
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