[单选题]The______tool is used in precision work to smooth or enlarge a slightly undersized holeA．round outB．round fileC．reamerD．hole driller
[单选题](假设precision=TP/(TP+FP),recall=TP/(TP+FN)。)在二分类问题中，当测试集的正例和负例数量不均衡时，以下评价方案哪个是相对不合理的()A．Accuracy:(TP+TN)/allB．F-value:2*recall*precision/(recall+precision)C．G-mean:sqrt(precision*recall)D．AUC:曲线下面积