A yellow signal，floating in the air from a parachute，about 300 feet above the water，indicates that a submarine（）.<br>A:will be coming to periscope depth<br>B:will be coming to the surface<br>C:is on the bottom in distress<br>D:is in distress and will try to surface

A yellow signal，floating in the air from a parachute，about 300 feet above the water，indicates that a submarine（）.
A:will be coming to periscope depth
B:will be coming to the surface
C:is on the bottom in distress
D:is in distress and will try to surface

出自：海船船员证

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