double wall knot：雙花繩端結(jié)

double volute pump 雙蝸殼式離心泵 | double wall knot 雙花繩端結(jié) | double wall piping system 雙層壁管系

double broadswords：雙刀

61) 雙棍 double staffs | 62) 雙刀 double broadswords | 63) 雙手刀 double handed broadswords

double handed broadswords：雙手刀

62) 雙刀 double broadswords | 63) 雙手刀 double handed broadswords | 64) 雙頭雙槍 double two-headed spears

double spiral staircase：雙螺旋樓梯

double spine saw ==> 復(fù)齒鋸 | double spiral staircase ==> 雙螺旋樓梯 | double spiral turbine ==> 雙排量渦殼式水輪機(jī)

double snap roll：雙快滾

double slotted flap 雙縫襟翼 | double snap roll 雙快滾 | double spar wing 雙樑機(jī)翼

double rotary engine：雙排缸回轉(zhuǎn)引擎

688 雙行鉚接 double rivet joint | 689 雙排缸回轉(zhuǎn)引擎 double rotary engine | 690 雙座停止閥 double seat stop valve

double rotary engine：雙排缸旋轉(zhuǎn)引擎

雙滾子導(dǎo)索器 double roller chock | 雙排缸旋轉(zhuǎn)引擎 double rotary engine | 雙排缸回轉(zhuǎn)引擎 double rotary engine

double-flow reaction turbine：雙流反動式汽輪機(jī)

double-faced pallet 雙面托盤 | double-flow reaction turbine 雙流反動式汽輪機(jī) | double-flow steam turbine 雙流式汽輪機(jī)

double-flow reaction turbine：雙流反動式渦輪機(jī)

double-faced pile 雙面絨 | double-faced satin 雙面緞 | double-flow reaction turbine 雙流反動式渦輪機(jī)

double radio source：射電雙源

double quenching || 二次淬火,復(fù)淬 | double radio source || 射電雙源 | double ratio || 交比,非調(diào)和比