已知:部分阳离子以氢氧化物的形式完全沉淀时的pH如下表所示,回答下列间题
沉淀物
Al(OH)3
Fe(OH)3
Fe(OH)2
Ni(OH)2
pH
5.2
3.2
9.7
9.2
It's nearly five o'clock. We have to go now, or we will miss the bus.
学习是____ 不断地接受刺激、获得新的____ 、习惯和积累经验的过程.
⑴My favourite song is the ABC song.____
⑵Tom goes to the zoo on Saturdays.____
⑶Look at the dog. It's thin.____
⑷The sweater is on the bed.____
⑸—What are they? ____
—They're trees.
A. B. C. D. E.
读中南半岛地形图,回答下面小题。