Line throwing apparatus aboard ship must contain（）.<br>A:two rockets，one of which shall be the buoyant type<br>B:three rockets，one of which shall be the buoyant type<br>C:four rockets，two of which shall be the buoyant type<br>D:five rockets，two of which shall be the buoyant type

Line throwing apparatus aboard ship must contain（）.
A:two rockets，one of which shall be the buoyant type
B:three rockets，one of which shall be the buoyant type
C:four rockets，two of which shall be the buoyant type
D:five rockets，two of which shall be the buoyant type

出自：海船船员证

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