A:在0.1 mol·L-1 NH4Cl溶液中:c(NH4+)=c(Cl-)
B:在0.1 mol·L-1 NaHCO3溶液中:c(Na+)=c(HCO)+c(CO)+c(H2CO3)
C:pH=2的醋酸溶液与pH=12的NaOH溶液等体积混合:c(Na+)>c(CH3COO-)>c(OH-)>c(H+)
D:在0.1 mol·L-1 Na2S溶液中:c(OH-)=c(H+)+c(HS-)+c(H2S)
下图器物叫____;它是____代铸造的一种青铜器;反映了商周的____工艺。
从方框A—E中选出可以填入对话空白处的最佳选项。
A.Yes, she does.
B.She’s helpful and cheerful.
C.Who is your friend?
D.What does she look like?
E.And she also likes Art.
A: ____
B: Alice.
B: She’s tall. She has long black hair.
A: What do you like about her?
B: ____
A: What’s her favourite hobby?
B: She likes swimming best. ____
A: Does she do well in all her subjects?
B: ____She often helps me with my studies.