背景： 某地对一民用机场进行扩建，工程项目包括场道工程、助航灯光工程、空管工程和航站

跳汰机机体下部排料口至脱水斗子的入料口之间的密封溜槽的倾角应不小于45°，以保证物料畅通不堵塞。

水龙头提环直径磨损达到（）MM，必须立即更换。

One day Tom and I were walking down the street while we saw an old man fall off his bike. He was badly hurt. Many people crowded around us. Someone suggested carrying the old man to the roadside, so Tom disagreed. He has learned first aid. He said that they ought to leave him where he was and checked him first. At that time the old man wasn't breathing. Tom asked me to call in the First Aid Center at once and he began to start the old man's breathing, use the mouth-to-mouth way. Within five minutes, the old man began to move little and doctors also arrived. They said that we had done was correct. I have learned from this experience that a knowledge of first aid can make a really difference.

新生儿贫血标准为（）

A.Hb<150g/L

B.Hb<145g/L

C.Hb<120g/L

D.Hb<110g/L

E.Hb<90g/L

下列有关实验的说法正确的是

A．除去铁粉中的铜粉，加入足量浓硫酸加热反应后进行过滤

B．不用任何其他试剂就可以鉴别NaOH溶液和Al₂（SO₄）₃溶液

C．制备Fe（OH）₃胶体，通常是将Fe（OH）₃固体溶于热水中

D．某溶液加入盐酸能产生使澄清石灰水变浑浊的气体，则该溶液一定含有大量CO₃^2-