在PCB设计中的DRC电气规则检查主要有几种方式？
参考答案：
实时检查（On-Line DRC）和分批检查（Batch DRC）
—I called you at seven o’clock last evening, but nobody answered the phone.
—Oh, my husband and I __________ outside.
A. took a walk
B. have taken a walk
C. were taking a walk
假阳性率也称为（）
A.漏诊率
B.误诊率
C.阳性预测值
D.阴性预测值
E.灵敏度
