Bach died in 1750, but it was not until the early 19th century____ his musical gift was fully recognized.
A:while
B:though
C:that
D:after
从溴乙烷制取1,2﹣二溴乙烷,下列转化方案中最好的是( )
给我国广大地区带来丰富降水的风是( )
park(复数)____
如图,L是四边形ABCD的对称轴,如果AD∥BC,有下列结论: