doubleraten.双率计doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double closed - loop双闭环double curved catheter双弯形导尿管Double-square-root双平方根double circuit feeding双回供电double beater scutcher双打手清棉机doublewinding armature双绕组电枢double quote character双引证字符double-thread method双丝法double precision array双精度数组double pressure system双极施压法