不改变数的大小,下面的数中,( )里的“0”都可以去掉.
A:5.007
B:9.200
C:50.60
当北半球夏至日时,出现极昼现象是地区是
I was watching the clock all through the meeting, as I had a train ______.
方程x2=9的根是( )