前馈控制的特点是稳定性好，其总趋势是保持系统的平衡状态。
参考答案：错
He was wearing his dark glasses to _____ his eyes from the strong sunlight. [ ]
A. defend
B. protect
C. prevent
D. stop
电力系统中性点装消弧线圈的作用是什么？
