The control difficulty points of drum water level, three parameters system structure of boiler water level system, control strategy choosing and control algorithm of HSIC were studied.
研究了汽包液位控制的难点、锅炉水位三冲量系统结构、控制策略选取及HSIC控制算法。
The last three parameters are used to set system properties, as shown in Listing 1.
最后三个参数用于设置系统属性，如清单1所示。
The sigaction system call takes three parameters
sigaction 系统调用需要使用 3 个参数
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