15.(18分)(1)干燥管碱石灰(每空2分,共4分)(2)2NH4CI Ca(OH)2=CaCl2 2NH3 2H20(2分)(3)平衡压强,使分液漏斗中的液体顺利流出(2分)(4)NH4SCN KOH=KSCN NH31 H2O(2分)(5)2NH3 Cr2O12- 8H=2Cr3 N2 TH2O(2分)(6)蒸发浓缩冷却结晶(每空1分,共2分)(7)①溶液红色褪去,且30s不变色②72.75%(每空2分,共4分)
One possible versionSeveral minutes later, the ice broke suddenly and Harry's feet sank into the water. It was noep, but his legs got wet to the knees. Harry was so upset that the accident would delay hisschedule. He had to find some firewood to build a fire to dry his clothes. He pulled off his glovestook out his matches, and lighted the fire. Seeing the burning fire, he had thought he was safe. Butsuddenly, without warming, a heavy mass of snow dropped down. The flame of hope was put outUnluckily, his dog ran away and the fear of death came over Harry. He had no choice but torun to save himself. However, he did not feel his feet when they hit the ground. Having falleneveral times, he decided to rest a while. As he lay in the snow, he noticed he was not shaking. Hecould not feel his nose or fingers or feet. A feeling of horror came into his mind. It was when herealized he was going to die that he heard a bark and the noise his friends made
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