INMARSAT-C船站通信前必须向船舶所在洋区（）人网申请
A.任一地面站
B.网络协调站
C.网络协调站指定的岸站
D.操作员选择的岸站
参考答案：B
About half of million of Afghans have no_______ to basic health services due to continued war and
conflicts.[ ]
A. means
B. approach
C. channel
D. access
若m•23=26，则m等于（ ）
A．2
B．4
C．6
D．8
