如图所示连通器内有两种液体,其中带斜线部分是水,带点的部分是不知密度的液体,连通器竖直放置时,液体处于平衡,各液面高度如图,由此可知液体的密度为 kg/m3.
533
Speaker A: Could I trouble you to return these two books for me Speaker B:_____
A.It's no trouble at all.
B.Yes, please.'
C.Why didn't you go to the library yourself
D.Sure, I'll be glad to.
如图所示杠杆中,属于费力杠杆的是( )
A.
撬棒
B.
跷跷板
C.
小推车
D.
鱼竿