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【单选题】
主动式声纳的特点是：（）
A.
易被敌方侦听
B.
侦察距离较远
C.
保密性好
D.
不能探测静止无声的目标
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【单选题】As in the field of space travel, so in undersea exploration new technologies continue to appear. They share a number of similarities with each other—as well as some important differences. Manned subme...
A.
the ocean depths
B.
the communication problem
C.
the movement of waves
D.
the problem of vacuum
相关题目：
【单选题】As in the field of space travel, so in undersea exploration new technologies continue to appear. They share a number of similarities with each other—as well as some important differences. Manned subme...
A.
the ocean depths
B.
the communication problem
C.
the movement of waves
D.
the problem of vacuum
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