如果两个同频率的交流电的相位角，分别为φ1和φ2，其φ1-φ2<90o时，称做（）。
C
暂无解析
ModernEnglishwordsman,woman,child,eat,fight,etc,originatefrom______.
When________totellthedifferencebetweenBritishandAmericanEnglish,thelinguistmadealongand________speech.
Thereisagrowingbodyofevidencetosupportthefactthatmostpeoplesufferfromalackofdaydreaming_______anexcessofit.
Weareinterestedintheweatherbecauseit_______ussodirectly—whatwewear,whatwedoandevenhowwefeel.