—Speaking of basketball,Daniel is the best.
—________. Actually he'll make a successful sportsman,I think.
A:No idea
B:Not likely
C:Hard to say
D:That's for sure
如图所示,用F=50N的水平拉力,通过一个动滑轮,使重为200N的物体A水平向右匀速移动了3m,在这个过程中()
橡胶、玻璃、石墨中属于导体的是____ ;发光二极管是一种电子元件,简称LED.通过观察LED是否发光,不但可以判断电流的有无,还能够判断电流的____.
Can you hear Lucy_____ loudly in the next room?