英语词汇

• 有无介词有什么不同？

  When you go on a holiday, its always a problem to decide_________.A. where to live B. where to live in 请教老师， A和B都是对的吗？假如

• 专业词汇|Metal Terminology (V-Z)金属术语V-Z

  Metal Terminology1 VVACUUM DEGASSINGVANADIUM - Element No. 23 of the periodic system; atomic weight 50.95. Gray-white, h