单项选择题
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信度系数的定义公式是( )。
A.{{*HTML*}}<p><img alt="" src="../AttachFilePick.aspx?path=\ExamPaperRes\2019\3\29\e0a956e83b764db193dd3a197bd2ccf0\90dc913baa824a6a81a7a2e13093323b.png" style="width: 79px; height: 51px;" /></p>
B.{{*HTML*}}<p><img alt="" src="../AttachFilePick.aspx?path=\ExamPaperRes\2019\3\29\e0a956e83b764db193dd3a197bd2ccf0\2be024c6a162494db55fba2e72197af4.png" style="width: 75px; height: 59px;" /></p>
C.{{*HTML*}}<p><img alt="" src="../AttachFilePick.aspx?path=\ExamPaperRes\2019\3\29\e0a956e83b764db193dd3a197bd2ccf0\684d0af03f11492082463d05c35f6e0b.png" style="width: 86px; height: 50px;" /></p>
D.{{*HTML*}}<p><img alt="" src="../AttachFilePick.aspx?path=\ExamPaperRes\2019\3\29\e0a956e83b764db193dd3a197bd2ccf0\c6c73e72da06494a8586e55e79aea786.png" style="width: 81px; height: 54px;" /></p>