如图所示,矩形导体线圈abcd在匀强磁场中绕垂直于磁感线的对称轴OO′匀速转动,沿着OO′方向观察,线圈沿逆时针方向转动。已知匀强磁场的磁感应强度为B,线圈匝数为n,ab边的边长为l1,ad边的边长为l2,线圈电阻为R,转动的角速度为,则当线圈转至图示位置时
When you feel helpless and ______,just remember you are not ______ in the world because your friends are around you ( )
alone;alone
alone;lonely
lonely;alone
Did you make the kite ______,kids?
No,our uncle made it for us.( )
yourselves
yourself
themselves
Whose bike is this?
I am not sure.It ______ be Mary's ( )
shall
must
might
David is a fantastic singer ______ can play different kinds of music.( )
which
who
whom
How can I get some______ about the 2016 Olympic Games?
Why not search the Internet?( )
information
experience
practice