选词填空。
A. This is Mary. She's nine. She's tall. She's thin.
B. This is Danny. He's six. He's short. He's fat.
C. This is Eddie. He's nine. He's short. He's thin.
如图所示,斜面放置于粗糙水平地面上,物块A通过跨过光滑定滑轮的轻质细绳与物块B连接,系统处于静止状态,现对B施加一水平力F使B缓慢地运动,使绳子偏离竖直方向一个角度(A与斜面均保持静止),在此过程中( )
下项关于中国民族资本主义在各阶段的发展表述不符合事实的是( )
读图,回答问题。
清人王鸣盛论及汉代官制,“以尚书与三公对言,三公权不及尚书;以尚书与中书对言,尚书又不及中书矣……要之士人必不如宦人之犹亲密”,这说明汉代
关于电磁场和电磁波,下列说法中正确的是( )