如图所示,晾晒衣服的绳子轻且光滑,悬挂衣服的衣架的挂钩也是光滑的,轻绳两端分别固定在两根竖直杆上的A、B两点,衣服处于静止状态.如果保持绳子A端位置不变,将B端分别移动到不同的位置时,下列判断正确的是( )A.B端移到B1位置时,绳子张力不变B.B端移到B2位置时,绳子张力变小C.B端在杆上位置不动,将杆移动到虚线位置时,绳子张力变大D.B端在杆上位置不动,将杆移动到虚线位置时,绳子张力变小
There are ______ cars in the street.It's so crowded.( )
hundred
hundreds
hundred of
hundreds of
Mr.Wang teaches _______ Chinese.( )
us
we
our
your
Hello!Is that Peter speaking?Yes,_______.( )
It's Peter
I'm Peter
this is Peter
Peter is me
﹣Which season do you like in Panzhihua,dry season or rainy season?
﹣Rainy season.( )
well
better
best
the best
He speaks English very well because he in the US for 20 years.( )
lives
lived
has lived
had lived