A:温度计水银球在支管口附近
B:加热时要注意使温度缓慢上升至170℃
C:反应过程中溶液的颜色会逐渐变黑
D:生成的气体中除乙烯外还有浓硫酸被氧化后生成的SO2
唐宋时期,众多诗词作品得以刊印成集,主要得益于( )
—Della likes dancing, but doesn't like swimming.—____________.
This is a photo of my family . I'm John . I'm ten . My sister is seven . We are in the same school .My grandparents are Americans . My father is 42 .He is a driver . My mother is 40 . She is a teacher . We are very happy .
①在图中,用线条连接北斗七星,使它们成为勺子形状。
②在图中,圈出北极星。