题干
— _______ heads means No in China but Yes in India.
— Sounds interesting.
A：Shaking
B：Moving
C：Hitting
D：Washing
答案(点此获取答案解析）
A
— _______ heads means No in China but Yes in India.
— Sounds interesting.
A：Shaking
B：Moving
C：Hitting
D：Washing
，O为AB连线中点. 一质量为m带正电q质点以初动能E0，从a出发沿直线向b点运动，第一次滑到O点时动能2E0为，到b点的动能恰好为0，重力加速度为g，则（ ）