【单选题】Which one is not an air vehicle which is heavier than air? eavier than air
【简答题】Which is heavier, a pound of cotton or half a kilogram of gold?
【单选题】在网络中使用5类UTP作为传输介质,单段UTP的最长长度为______m。
【单选题】Which is heavier, gold or silver?
【单选题】作为科学研究材料最有名的以下哪种昆虫( )
【简答题】Which is heavier, ________elephant or ________ horse?