double-action disc harrow：雙排式圓盤耙

double-action black japanned spring hinge 黑漆雙彈簧鉸鏈 | double-action disc harrow 雙排式圓盤耙 | double-action gin 雙動式軋棉機

double-action disc harrow：雙動盤耙

"復式道岔","Double turnout" | "雙動盤耙","Double-action disc-harrow" | "雙浮標寄船碇","Double-buoys mooring"

double-action disc harrow：(雙列圓盤靶)雙功圓盤靶

double-action die ==> 雙效沖模 | double-action disc harrow ==> (雙列圓盤靶)雙功圓盤靶 | double-action disk harrow ==> 雙排式圓盤耙

double-action disk harrow：雙排式圓盤耙

double-action disc harrow ==> (雙列圓盤靶)雙功圓盤靶 | double-action disk harrow ==> 雙排式圓盤耙 | double-action forming ==> 雙效成形

Double-armed：雙臂的,復式臂的

Double-acting 雙作用的,雙動式的 | Double-armed 雙臂的,復式臂的 | Double coating 雙重涂層

double-bladed plough：雙鏵犁

double-bladed knife switch 雙閘刀開關 | double-bladed plough 雙鏵犁 | double-bonded hydrocarbon 雙鍵烴

double-bottom compartment：雙層底艙

double-block and bleed assembly 雙止回裝置和放氣設施 | double-bottom compartment 雙層底艙 | double-bottom margin 雙層底邊板

double-bottom space：雙層底空間

double-bottom margin 雙層底邊板 | double-bottom space 雙層底空間 | double-bottom tank 雙層底艙

double-bottom margin：雙層底邊板

double-bottom compartment 雙層底艙 | double-bottom margin 雙層底邊板 | double-bottom space 雙層底空間

double-bottom vessel：雙底船

雙系纜柱 double-bitt | 雙底船 double-bottom vessel | 雙斷開關 double-break switch