A:10
B:18
C:19
D:2
由匀速直线运动公式V=st可知,匀速直线运动的速度( )
It's difficult for the village children to cross the river to get to school. We think a bridge________ over the river
***在《湖南农民运动考察报告》里指出,反封建闹革命就是要反对四权(神权、政权、族权、夫权),下列哪一制度体现了明显的族权