?二速泵    two speed pump

?两级压缩    two stage compression

?二冲程引擎    two stroke engine

?二冲程油机    two stroke oil engine

?双线系统    two wire system

?[容许]二舱区浸水船    two-compartment ship

?双脚螺桨支架    two-leg propeller strut

?二节点振动    two-node vibration

?二段增压机    two-stage supercharger

?二冲程循环    two-stroke cycle (or two cycle)

?双通旋塞    two-way cock

?双向无线电话设备    two-way radiotelephone apparatus

?型式认可    type approval

?基型船    type ship

?球缘    T型材 bulb tee

?    T型材 T bar

?    T型材 tee bar

?    T形件 T piece

?    T形天线 "T" aerial

?    T形头 T head

?    T形导波管 tee wave guide

?    T形接头,三通管接 T joint

?    T形联接 T connection