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Double up and secure：加双缆挽紧

double universal coupling 双万向联轴器 | Double up and secure! 加双缆挽紧 | double up 加双绑

Double up and secure：各缆打双

double sight 隔时测天 | double up and secure 各缆打双 | double-hose rigs 双管设备

double valued function：双值函数

double tangent 二重切线 | double valued function 双值函数 | double vector product 二重向量积

double-acting cylinder：双酌汽缸

double acting compressor 双动压缩机 | double acting cylinder 双酌汽缸 | double acting engine 双酌发动机

double-acting cylinder：双作用汽缸

double-acting compressor 双作用式压缩机 | double-acting cylinder 双作用汽缸 | double-acting duplex slush pump 双动双工泥浆泵

double-acting hinge：双面铰链

double-acting hand force pump 双作用手摇泵 | double-acting hinge 双面铰链 | double-acting jack 双作用千斤顶

double-acting hinge：双动铰链

"double-acting hammer","双动鎚" | "double-acting hinge","双动铰链" | "double-acting pawl","双动爪"

double-acting hinge：双向合页

double-acting hammer 复动式锻锤 | double-acting hinge 双向合页 | double-acting pawl 双动棘爪,双动爪

double-acting jack：双作用千斤顶

double-acting hinge 双面铰链 | double-acting jack 双作用千斤顶 | double-acting napping machine 双动起毛机

double-acting jack：双动千斤顶

"双动锤","Double acting hammer" | "双动千斤顶","Double acting jack" | "双动式打桩机","Double acting pile driver"

Plata：普拉塔

如普拉塔(PLATA)地区的皮子品种很多,一般可分为两大类,即干板皮和盐腌皮,干板皮有Sanos、Besse?鄄chos、Maldesechos、Inservi-bles和Garras,质量最好的是Sanos,质量较次的是Garras. 盐腌皮中质量最好的是Mataderos,较次的是Campos.

transistor automatic computer：晶体管自动计算机

transistor amplifier 晶体管放大器 | transistor automatic computer 晶体管自动计算机 | transistor base current 晶体管基极电流