The Meglev Train travels in a vacuum between two magnets, ___ no pollution is caused and less energy is consumed.
A.where | B.which | C.when | D.therefore |
相关知识点
推荐套卷
The Meglev Train travels in a vacuum between two magnets, ___ no pollution is caused and less energy is consumed.
A.where | B.which | C.when | D.therefore |