Direct PCR直接PCRdirectadj.直接的；笔直的；坦白的v.对准；指挥；指示；命令direct torque-control直接转矩控制direct selection system直接选择方式Direct electrochemisrty直接电化学direct current abnormal直流异常direct writing recorder直接记录器direct injection burner直接注射燃烧器Direct Distance Service直接通话业务direct pressure closing直压法direct algebraic method直接代数法direct damage insurance直接损失保险