【单选题】The scientists began to accumulate data.
【单选题】3-1. 合成线形酚醛预聚物,应选用( )做催化剂。
【单选题】下图中哪个图的α角反映了直线AB对H面的倾角。
【简答题】Data : The that we collect when we do research.
【单选题】在直线飞行时,飞行员应该采用哪种方法来搜索左右的飞行器
【单选题】Her essay was entirely based on data ______ from reliable records.
【单选题】在直线平飞时,飞行员应该采用哪种方法来搜索左右的飞行器?