A:铝片跟氢氧化钠溶液反应:Al+2OH-=AlO2-+H2↑
B:硫酸镁溶液跟氢氧化钡溶液反应:SO42-+Ba2+=BaSO4↓
C:碳酸钙溶于醋酸:CaCO3+2CH3COOH=Ca2++2CH3COO-+H2O+CO2↑
D:铜片跟稀硝酸反应:Cu+NO3-+4H+=Cu2++NO↑+2H2O
可在酒精灯火焰上直接加热的玻璃仪器是( )
图为人体某结构的血管和血液流动的方向示意图.
用括号内所给动词的适当形式填空。The garden is the best place ____ (grow) flowers.This pair of jeans ____ (match) his white shirt.Listen! How wonderful the music____ (sound) ! Mary, ____ (not be) afraid of the dog. It never bites. Keep quiet, the students ____ (prepare) for the coming exam.____ (ride) a bike to school is good for your health.Sandy spends a lot of time____ (chat) with her e-friend on the Internet.How long does it take you____ (walk) to school every day?I don’t have any ideas, I don’t know where ____ (go).Would you like____ (drink) a cup of tea?