如图所示,左侧是倾角为60º的斜面、右侧是四分之一圆弧面的物体A固定在水平地面上,圆弧面底端的切线水平。一根轻绳两端分别系有质量为m1、m2的小球,跨过A顶端的定滑轮,当两球处于平衡状态时,右侧轻绳与水平方向夹角为60º,不计一切摩擦,两小球均可视为质点,则两小球的质量之比m1∶m2为
It's best not to run away from our problems.We should always try to them.( )
solve
take
get
Annie decides to work harder and get better grades next year.( )
many
much
very
"I've never been to Disneyland,Judy."" "( )
So have
Neither am
Neither have
Huangguoshu Waterfall is beautiful that I want to come here again next year.( )
so
too
such
We all know that one of the world's most popular sports football.( )
am
is
are