下列画面不能体现珍爱生命的是( )
A:
B:
C:
D:
数据17,19,17,18,21的中位数为( )
________himself in work makes it possible for him to achieve his goal.
一物体做匀变速直线运动,其位移与时间的关系是:s=2t+4t2(m),由此可知( )