苏通卡每次充值金额为100元的整数倍,充值最高限额为()元。
A.5000
B.10000
C.50000
D.60000
参考答案:A
— Do you think he is naughty enough?
— I'm afraid he's ____ than naughty. [ ]
A. more clever
B. clever
C. much clever
D. much more clever
如图所示,不计一切阻力,将摆球由虚线位置从静止开始自由释放,已知摆的摆长为0.2m,摆球质量为0.5kg,则小球摆到最低点时的速度为________,重力的功率为_______。(g取l0m/s2)