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【单选题】
用HCl标准溶液滴定Na2CO3时，用酚酞为指示剂，第一化学计量点变化不明显是由于( )。A.
Kb1和Kb2差别不大(Kb1／Kb2≈104)
B.
生成物HCO3-有缓冲作用
C.
指示剂不合适
D.
Kb1不够大
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举一反三
【单选题】The Gift of the Magi was written by
A.
Theodore Dreiser.
B.
O' Henry.
C.
William Faulkner.
D.
Mark Twain.
【单选题】In the story "The Gift of the Magi" by O · Henry, how did Della try to save money? Which of the following is NOT right?
A.
She bargained at the grocery, at the bakery and at the butcher’s.
B.
She had her long hair cut and sold it.
C.
She bargained at the grocery.
D.
She sold Jim’s gold watch.
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