【单选题】Deep-draught vessels and VLCCs shall keep at all times during the entire passage through the Straits of Malacca and Singapore a minimum UKC(under keel clearance of ______.
【单选题】Deep-draught vessels and VLCCs(大型油轮) shall keep at all times during the entire passage through the Straits of Malacca and Singapore a minimum UKC of ______.