带前馈的PID属于（）
A、常规PV算法点；
B、逻辑点；
C、数字组合点；
D、常规控制点。
参考答案：D
Miss Green didn't tell us _______ in 2002. [ ]
A. where does she live
B. Where she lives
C. where did she live
D. where she lived
保护渣的作用是什么？
