A:大兴安岭
B:太行山
C:昆仑山
D:秦岭
下面有关丙烷、丙烯、丙炔说法中正确的是( )
learn about, a few, come back, be over, thousands of, look for
一 TV says there will be a storm tomorrow.
一 ______. I planned to go climbing with my classmates.
鉴别空气、氧气、二氧化碳三瓶气体.通常的做法是( )
在⊙O的内接四边形ABCD中,AB=AD,∠C=110°,若点E在AD∧上,求∠E的度数.