[简答题]Camps are either temporary, that is changed from day to day, or they are permanent and may be visited year after year, or they may be used for a few weeks at a time.
第3题: [单项选择]在用衰减曲线法整定调节器参数时,其操作过程应是()。 A. 切除积分、微分作用,改变PB;使出现等幅振荡,记录此时PB和振带周期Ts B. 切除积分、微分作用,改变PB;使动态过程符合4∶1衰减比,记录PB和Ts C. 切除比例、微分作用,改变Ti使出现等幅振荡,记录Ti和Ts D. 切除比例、微分作用,改变Ti使动态过程符合4∶1衰减比,记录Ti和Ts 参考答案:B