***在文艺工作座谈会上的讲话中指出:“我们要走进生活深处,在人民中体悟生活本质、吃透生活底蕴。只有把生活咀嚼透了,完全消化了,才能变成深刻的情节和动人的形象,创作出来的作品才能激荡人心。”这一论断强调的是( )
①人民群众的聪明才智是文艺创作的根本动力
②只要深入社会实践就能创作出激荡人心的作品
③深刻反映社会生活本质的作品才是最有价值的
④文艺创作的不竭源泉在于人民群众的实践
A:①②
B:①③
C:②④
D:③④
On a ____tour in Britain, Freddy and the band were very popular. Fans showed much ____ to them. Freddy was very ____in the hall. After his most exciting____to perform on a TV program, things ____ wrong____they went, they were always ____ Finally, feeling____and ____, they realized that they must leave, or it might become too ____ for them. So they left Britain.
水平放置的水桶重300N,一人用250N的力竖直向上提水桶,则水桶受到的合力大小为( )
如图,匀强电场中有一半径为r的光滑绝缘圆轨道,轨道平面与电场方向平行.a、b为轨道直径的两端,该直径与电场方向平行.一电荷量为q(q>0)的质点沿轨道内侧运动,经过a点和b点时对轨道压力的大小分别为Na和Nb.不计重力,求:
电场强度的大小E;质点经过a点和b点时的动能.