2.4GHz时，全向吸顶天线的增益通常为（）。
参考答案：5DBI
A．B所受的摩擦力最小
B．当圆台转速增大时，C比B先滑动
C．当圆台转速增大时，B比A先滑动
D．C的向心加速度最大
CCTV-10 often plays ______ around the world. It can help us learn more about not only nature
but also different cultures and customs. [ ]
A. new something
B. something new
C. anything new
