单项选择题 The company should establish procedures by which（）receive relevant information on the safety management system in working language or language understood by them.

单项选择题 When two power-driven vessels are meeting head-on and there is a risk of collision,each shall（）.

单项选择题 The overall set in Malacca straight is to the NW, but from May to September there is a tendency for SE sets to prevail in some N and central parts.In this sentence,“set”refers to（）.