如图所示,两端敞口的容器用活塞 A,B封闭着一定质量的理想气体,容器和活塞用绝的泥粘C以速度v飞撞在A上并粘在一起后压缩气体,使气体的内能增加.则( )A.活塞 A获得的最大速度为v/2 B.活塞 B获得的最大速度为v/3 C.活塞 A、B速度第一次相等时,气体的内能最大 D.气体增加的最大内能为
The old man arrived Beijing a cold evening.( )
on,in
in,on
at,on
in,in
The Dragon Boat Festival was this year.( )
June the ninth
nine,June
the ninth July
nine,July
She is university student.She studies in university.( )
the,the
an,the
an,a
a、the.
My grandma is ill in hospital.
.( )
She is fine
My god
I'm sorry to hear that
I hope so
What is the man in the kitchen?
He is my father
A cook
He is from China
A cooker