For a ship not on an international voyage，an approved substitute for an impulse projected rocket-type line throwing appliance is a（）.<br>A:spring loaded line thrower<br>B:hand thrown buoyant line<br>C:shoulder-type line throwing gun<br>D:heaving line

For a ship not on an international voyage，an approved substitute for an impulse projected rocket-type line throwing appliance is a（）.
A:spring loaded line thrower
B:hand thrown buoyant line
C:shoulder-type line throwing gun
D:heaving line

出自：海船船员证

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