?淬火及回火    QT (= quenched and tempered)

?舵柄弧,象限,象限仪,扇形板    quadrant

?扇形肘板    quadrant bracket

?弧脚吊架    quadrant davit

?扇形齿轮    quadrant gear

?扇形舵柄    quadrant tiller

?四级膨胀机    quadruple expansion engine

?四行铆接    quadruple riveting

?四螺桨船    quadruple screw vessel

?四胀汽机    quadruple-expansion engine

?资格鉴定试验    qualification test

?定性分析    qualitative analysis

定性分析    qualitative analysis

?变质调整    qualitative governing

?品[质]管[制]    quality control (QC)

?质量因素    quality factor

?消音幅度(方探)    quality minima

?配合等级    quality of fit

?蒸汽干度    quality of steam

?定量分析    quantitative analysis

?流量控制调整    quantity-control governing

?检疫    quarantine

?检疫泊地    quarantine anchorage

?检疫艇    quarantine boat

?检疫旗    quarantine flag

?检疫船    quarantine vessel

?扇形舵柄    quardrant tiller

?夸(四分之一加仑)    quart

?船室,住舱,船尾部,罗经上四分之一点    quarter

?直角弯管    quarter bend

?艉主甲板    quarter deck

?舵工    quarter master

?侧梁柱    quarter pillar

?艉栏杆    quarter rail

?艉侧浪    quarter sea

?艉侧浪    quartering sea (or wave)

?四分之一波长天线    quarter-wave antenna

?准弧焊接    quasi arc welding

?准推进系数    quasi propulsive coefficient

?急冷弯曲试验    quench-bend test

?淬火及回火    quenched and tempered (QT)

?淬火回火钢,调质钢    quenched and tempered steel