—Most people said the film Let The Bullets Fly was wonderful _____ they watched it.—I agree with them, and I like it very much!
A:before
B:if
C:since
D:after
如图所示,在竖直向上的匀强磁场中,水平放置着一根长直流导线,电流方向指向读者,a、b、c、d是以直导线为圆心的同一圆周上的四点,在这四点中( )
已知M是△ABC的BC边上的一个三等分点,且BM<MC,若 AB→=a→ , AC→=b→ ,则 AM→ 等于( )