产生下列现象,只和空气中的水蒸气有关的是()
A:固体烧碱要密封存放
B:浓硫酸露置于空气中会增重、变稀
C:生石灰长期在空气中放置会变质
D:铜制品长期放在空气中会产生“铜锈”化学式为Cu2(OH)2CO3
— Ang Lee, a Chinese director, won the Best Director again in his last year.
— How great he was! It was his time to win an Oscar.
你想祝同学生日快乐,可以说
成分
蛋白胨
乳糖
蔗糖
K2HPO4
指示剂
琼脂
含量(g)
10.0
5.0
2.0
0.2
12.0
将上述物质溶解后,用蒸馏水定容到1000mL