-Qin Shu has just beaten Li Hui in our school ping-pong game!
-It's hard to _________ a girl with only one arm can play ping-pong so well!
A:change
B:remember
C:imagine
D:control
在内燃机工作的过程中,四个冲程中发生内能转化为机械能的冲程是( )
求证:|HM|= x02+y02+Dx0+Ey0+F ;