问题详情

Which of the following is true about the U. S. Navy underwater listening network？
A．It is now partly accessible to civilian scientists.
B．It has been replaced by a more advanced system.
C．It became useless to the military after the cold war.
D．It is indispensable in protecting endangered species.此题为多项选择题。请帮忙给出正确答案和分析，谢谢！