能耗制动的方法就是在切断三相电源的同时()
A、给转子绕组中通入交流电
B、给转子绕组中通入直流电
C、给定子绕组中通入交流电
D、给定子绕组中通入直流电
参考答案:D
With respect to the Global Investments Performance Standards (), which of the following statements is least accurate Verification:()
A. ensure the accuracy of composite presentations.
B. improve the consistency and quality of the firm's compliance presentations.
C. provide improved internal processes and procedures as well as marketing advantages to the firm.
臭氧氧化处理的主要任务是( )。
A.杀菌消毒 B.去除氮、磷造成水体富营养化的物质C.去除溶解性无机物 D.去除重金属