汽车在平直公路上以速度v0匀速行驶,发动机功率为P0,牵引力为F0.t1时刻开始,司机减小了油门,使汽车保持恒定功率P行驶,到t2时刻,汽车又开始做匀速直线运动,速度为v.已知运动过程中汽车所受阻力f恒定不变,汽车牵引力F随时间t变化的图像如图所示,则( )
The blue coat_____be Tony's. He never wears blue clothes.( )
can
must
can't
mustn't
_____Aron has lost his right arm, he never gives up his dream to climb mountains.( )
Since
Although
Unless
If
The accident took place_____ a cold November evening.( )
on
in
at
for
What_____useful book it is!
Yeah, it tells you how to play the guitar.( )
an
a
the
/
Our neighborhood is so dirty. Shall we clean it this afternoon or tomorrow?
____.Any time is OK.( )
It is up to you
Excuse me
Have a good time
I'm afraid I can't