变频器主电路中安装的断路器有什么作用?
航迹舵对指标航向修正量小数点位的处理方法为:() ["0.1~0.5取0,0.6~0.9取1.0","0.1~0.5取0.5,0.6~0.9取1.0","0.1~0.5取0,0.6~0.9取0.5","0.1~0.5取0.5,0.6~0.9取0.5"]
航迹舵位置偏移量(XTE)计算是以()为基准的。 ["真航线","推算航线","恒向航线","计划航线"]
变频器产品正在向哪三个方面发展?
某井使用3NB900泵,单泵钻进。其中泵缸套规格为φ150mm,泵冲速为50冲/分,则循环排量为()L/s。(已知:150mm缸套K=0.28) ["A、16","B、15","C、13","D、14"]
变频器的主要功能有哪些?