A:患轻微感冒后立即服用抗生素,以防引起炎症
B:每次用抗生素要用最新抗生素,有利于病情治愈
C:每次用抗生素要用广谱抗生素,有利于杀死更多细菌
D:每次用抗生素要用最对症的,且服用时间合适
— Well, not only adults _______ children celebrate it.
甲同学认为:两者反应生成只有CuCO3一种沉淀;
乙同学认为:这两者相互促进水解反应,生成Cu(OH)2一种沉淀;
丙同学认为:生成CuCO3和Cu(OH)2两种沉淀.
查阅资料知:CuCO3和Cu(OH)2均不带结晶水
A: —I'm ____ (sad; excited) because we're going to climb the mountain.
B: —That's ____(grey; great).
A: —I'm ____(scared; tired).
B: —Why are you scared?
A: —Because she's going into the cave. I heard a____ (toys; noise).
B: —Be careful!