【单选题】如果力 FR 是 F1 、 F2 二力的合力 , 用矢量方程表示为 FR=F1+F2, 则三力大小之间的关系为
【单选题】如果力FR是F1、F2二力的合力,且F1、F2不同向,用矢量方程表示为FR= F1+ F2,则三力大小之间的关系为( )。
【单选题】There seems to be a (n) ______ relationship between great event and migration.
【简答题】获得性血友病( acquired hemophilia , AH)
【单选题】如果力FR是F1、F2二力的合力,用矢量方程表示为FR= F1+F2,则三力大小之间的关系为( )。
【单选题】It seems that________them are out of work now. [ ]
【单选题】There seems to be a(n) ______ relationship between great events and migration.
【简答题】Enid seems to take great ______ (pleasant) in teaching English as a second language.