A:different from; in that
B:differs from; in which
C:differs from; in that
D:is different from; in which
“赤”字读音是chì,组词:赤红。( )
用手拍桌子,手和桌子之间发生了相互作用,若以手为研究对象,施力物体是( )
中国古代发明的某种工具,利用河水的冲力转动机械轮轴,使鼓风皮囊张缩,不断给高炉加氧,“用力少,见功多”。这项发明( )
27+13-20=____