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【单选题】
磷酸的 p K a1 、 p K a2 、 p K a3 分别为 2.12 、 7.20 、 12.36 ,在 pH=11.0 的溶液中,磷酸的主要存在形体为 ( )A.
磷酸根
B.
磷酸一氢根
C.
磷酸二氢根
D.
磷酸分子
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反馈参考答案：
举一反三
【单选题】When she was younger, why did Katniss venture into a wealthy area by herself?
A.
She was looking for food
B.
She was looking for a job
C.
She was after her mother
D.
She absent mindedly wandered away from her father
【单选题】下列哪项商品的标题是规范的? ( )
A.
百丽、达芙妮、玖熙 12 秋冬真皮牛皮长靴细跟高跟马靴
B.
2012 新款透气潮流帆布鞋 英伦男鞋
C.
夏季透气男生韩版帆布鞋雪地靴男鞋子
D.
玛丽珍 徐濠萦 范冰冰水晶凉拖鞋变色凉鞋
【简答题】How did people behave towards Cheryl when she was younger?
【单选题】When she was younger, my mother a depression so severe she had to be hospitalized.
A.
went through
B.
went about
C.
went along
D.
went around
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