如图所示，在竖直放置的光滑半圆弧绝缘细管的圆心_O处放一点电荷，将质量为_M，带电量为_q的小球从圆弧管的水平直径端点_C由静止释放，小球沿细管滑到最低点_B时，对管壁恰好无压力。则放于圆心处的点电荷在_C点产生的场强大小为

    Mary is an African elephant. Now she is 16 years old.She lives in the zoo. Mary has produced more than 50 drawings since last year. She has made over $2,500 for the zoo. Zoo leaders said Mary first showed the art ability (能力) about 4 years ago. Zoo workers watched her make the marks (痕迹) in the sand with her trunk (象鼻). She rubbed out (抹去) the marks, then made the new ones. The zoo workers gave her brushes and paints. Soon Mary was drawing pictures. Newspaper reporters wrote about Mary, and then people went to buy her pictures. And in this way she made a lot of money for the zoo by drawing.

    This is how Mary does the drawing.A zoo worker holds different color paints and Mary touches the colors she wants. Then the worker gives her chosen color to the brushes in her trunk and Mary begins to paint.

如图钟表所示的是北京、东京、堪培拉、莫斯科四城市的时间．读图，完成问题．
 
根据上题判断结果，若此时恰为莫斯科日出时间，则澳大利亚（ ）