【单选题】Vessels entering Malacca Strait from W, __________ to use the through route, ________ in the vicinity of Permatang Sedepa at the NW end of the narrow part of the Strait.
【单选题】Vessels entering Malacca Strait from W, to use the through route, in the vicinity of Permatang Sedepa at the NW end of the narrow part of the Strait.