单项选择题 游离皮片移植后血浆营养期的时间为

单项选择题 危险物品包装件装入飞机货舱后，装载人员应设法固定，防止其在飞机飞行中倾倒或翻滚，造成损坏。这是运输危险物品应遵循的()。 方向性原则C. 轻拿轻放原则D. 固定货物、防止滑动原则

单项选择题 When expressing meaning, we don’t just use language, we need additional information.Match the term with its explanation.Information about the speaker and hearer.A.Why are the speakers talking to each other?B.When and where is the discourse taking place?C.By what means are the speakers interacting.D.Who are they and what is their relationship?