18. A routewhich is primarily selected for use by ships which, because of their deep draught, may not be able to navigate safely outside such route defines .
(A) sailingroute
(B) deep-draught route
(C) deep-water route
(D) safe route

答案：登入後查看
統計： A(1), B(5), C(1), D(3), E(0) #1235210