—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
下列叙述中哪一项是错误的( )
观察下列单项式:a,-2a2,4a3,-8a4,16a5……,按规律第个单项式是____ .(是正整数)
将活的鲤鱼从水中取出,鲤鱼不久便会死亡,其原因是( )
某学校地理兴趣小组设计并做了如下实验。据此回答下列各题。
由牛顿第二定律知,无论怎样小的力都可以使物体产生加速度,可是当我们用一个力推桌子没有推动时是因为 ( )