孔子“登东山而小鲁”的“东山”指沂山。
参考答案：错
— What's five and two?
— It's ________________. [ ]
A. seven
B. seventh
C. the seventh
D. the seven
A．a为动滑轮，B端钢缆受到滑轮组的拉力大小约为3G
B．a为动滑轮，B端钢缆受到滑轮组的拉力大小约为G
C．a、c为动滑轮，B端钢缆受到滑轮组的拉力大小约为3G
D．a、c为动滑轮，B端钢缆受到滑轮组的拉力大小约为G
G
G