如图所示,在水平桌面上一本静止的书上竖直放置一块橡皮,当书突然向右运动时,橡皮将会____;如果书表面绝对光滑,上述现象中橡皮将会____.(以上两空选填“向右倾倒”、“向左倾倒”或“停在原处”)
已知圆C1:x-22+y-32=1,圆C2:x-32+y-42=9,M,N分别是圆C1,C2上的动点,P为x轴上的动点,则PM+PN的最小值为( )
根据表格内容, 选择正确答案。
(B)
Wang Wei
I can't sing or dance. I can play the guitar. But I couldn't play it three years ago.
Alice
I can sing and dance. I can also play the piano. When I was six, I couldn't play the piano at all.
James
I can swim and cook. I can't draw pictures. I could swim when I was five years old.
Liu Fang
I can perform ballet and dance to disco. I can also sing English songs. But I couldn't sing English songs two years ago.
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