单项选择题
Do you require any further assistance ? My ship is safe now and no assistance is necessary.This VHF communication generally takes place during（）.
A.salvage operation B.cargo discharging C.bunkering D.towing operation
单项选择题 （）both anchors.
单项选择题 The control of distress traffic is the responsibility of（）.
单项选择题 What is meant by veering the anchor chain? （）
