【简答题】投影线是指一条( )沿某一方向向曲面作投影时形成的影子线
【单选题】He hadn't _______ quite what was wrong with .his mother. He knew, though, that she hadn't been well for some time now.
【单选题】Although he has lived with us for years, he_____ us much impression. [ ]
【简答题】()是指一条曲线沿某一方向向曲面作投影时形成的影子线
【简答题】В настоящее время ( )
более 50 товаров, являющихся обьектами биржевой торговли.A. А. имеется B. В. насчитывается C. С. насчитывали D. Д. насчитывалось
【单选题】He demanded that we explain why things went wrong,______?
【单选题】He demanded that we explain what was happening,
【简答题】投影线是指一条曲线沿某一方向向曲面作投影时形成的()
【单选题】Ted together with his friends had a good time when hiking, ?