Ⅰ操作
Ⅱ结论
A
滴加Ba(OH)2溶液生成白色沉淀
原溶液中有SO 42−
B
滴加AgNO3溶液生成白色沉淀
原溶液中有Cl﹣
C
滴加过量浓NaOH溶液并加热,将湿润红色石蕊试纸置于试管口,试纸变蓝色
原溶液中有NH 4+
D
滴加氯水和CCl4,振荡、静置,上层溶液显紫红色
原溶液中有I﹣
A:A
B:B
C:C
D:D
初级消费者的能量,其去向不包括
⑴Where are you?____ A. I'm talking to my friend.
⑵Excuse me. Where is the supermarket, please?____ B. I'm behind the tree.
⑶Thank you.____ C. Turn left.
⑷Where is the train? ____ D. It's at the station.
⑸What are you doing?____ E. You are welcome.
根据图中数据,可以求出速度是____。