【多选题】电动机可以通过改变( )三种方法调速,而三相笼型最常用的方法是( )。
【简答题】异步电动机可以通过改变()、改变()和()三种方法调速,而三相笼型异步电动机最常用的调速方法是改变()。
【单选题】When deciding the composition of the engineering watch, which may include appropriately qualified ratings, following criteria shall be taken into accountⅠ.the type of shipⅡ.the type and condition of t...
【单选题】Banks normally give______to large businesses when deciding on loans.