A、<img width="60" height="21" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/3411741a-5191-4287-ac01-9d76c3e7e249.png" />
B、<img width="60" height="21" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/d56d8d9b-cf7a-4290-919f-ce750582eb64.png" />
C、<img width="65" height="21" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/d17e070a-e1b1-494f-a7e6-9afa5397a934.png" />
D、<img width="60" height="21" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/2133cf98-5ed5-408e-96e7-f36c25186a57.png" />
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，则相应的弱酸强碱盐MA的标准水解常数为（ ）。