Emergency towing arrangements shall be fitted at both ends on board every tanker of not less than ( ) tonnes deadweight.
A.10000 B.20000 C.30000 D.50000正确答案B
Emergency towing arrangements shall be fitted at both ends on board every tanker of not less than ( ) tonnes deadweight.
A.10000 B.20000 C.30000 D.50000正确答案B