| isomorphic complex | 同构复合形 | |
| isophot curve | 等照度曲线 | |
| isoplanar based integrated circuit | 等平面隔离集成电路 | |
| isoplanar isolation | 等平面隔离 | |
| isoplanar process | 等平面工艺 | |
| isoplanar system | 等平面系统 | |
| isoplanar technique | 等平面工艺 | |
| isoplanar transistor | 等平面晶体管 | |
| isopotential point | 等电位点 | |
| isothermal gas chromatography | 等温层跟踪仪 | |
| isothermal point | 恒温式热量计 | |
| isothermal recrystalization | 等温再结晶 | |
| isothermal weight change curve | 等温重量变化曲线 | |
| isothermal weight change determination | 等温重量变化测定 | |
| isotope dilution mass spectrometry | 同位素稀释质谱法 | |
| isotope frequency | 同位素频率 | |
| isotope generator | 同位素电源 | |
| isotope mass spectrometer | 同位素质谱计 | |
| isotope peak | 同位素峰 | |
| isotope ratio measurement | 同位素丰度测定 | |
| isotopic abundance | 同位素丰度 | |
| isotopic standard | 同位素标准 | |
| isotropic antenna | 无方向性天线 | |
| isotropic body | 各向同性体 | |
| isotropic etch | 各向同性腐蚀 | |
| isotropic etching | 各向同性腐蚀 | |
| isotropic medium | 各向同性媒质 | |
| isotropic radiation | 各向同性辐射 | |
| isotropic scattering | 各向同性散射 | |
| isotropy | 各向同性 | |
| isovalent impurities | 等价杂质 | |
| item | 项(目) | |
| iterated integral | 迭积分,累积分 | |
| iteration chromatography | 核对色谱法 | |
| iterative attenuation | 累接衰减 | |
| iterative impedance | 累接阻抗 | |
| iterative matching | 累接匹配 | |
| ivory point | 象牙针尖 | |
| j-number | 虚数 | |
| jack | 千斤顶,插孔 | |
| jack bolt | 起重螺栓 | |
| jack fastener | 插口线夹 | |
| jack leg | 溢流管 | |
| jack panel | 插孔接线板 | |
| jack strip | 插孔簧片 | |
| jack switch | 插接开关 | |
| jack system | 顶起装置 | |
| jack-in type | 插入式 | |
| jackengine | 辅助发动机,小型蒸汽机 | |
| jacket | 外壳 | |
| jacket heater | 套式加热器 | |
| jacket heating | 套式加热 | |
| jacket heating system | 套加热系统 | |
| jacket insertion depth | 套管插入深度 | |
| jacket steam | 夹层蒸汽 | |
| jacketed | 包套的 | |
| jacketed cylinder | 有套汽缸 | |
| jacketed insulation | 管道有包套的隔热层 | |
| jacketed wall | 双层壁 | |
| jacketing | 套,夹套换热 | |
| jacking | 提升 | |
| jacking oil | 顶轴油 | |
| jacking oil pump | 顶轴油泵 | |
| jacking screw | 螺旋千斤顶,顶起 | |
| jacking system | 提升机构 | |
| jackshaft | 中间轴,传动轴 | |
| jacobi's integral | 雅可比积分 | |
| jade green | 浅绿 | |
| jaff | 复式干扰 | |
| jagged edges | 不平坦边缘 | |
| jalousie | 百叶窗 | |
| jam | 压紧 | |
| jam nut | 锁紧螺母 | |
| jam weld | 对头焊接 | |
| jam-free | 无干扰的 | |
| jam-to-signal | 干扰信号比 | |
| jamb | 门窗侧壁,门窗梃(tǐng) | |
| jamb lining | 门口镶板 | |
| jammer | 干扰发射机 | |
| jamming | 干扰 | |
| jamming of fuel elements | 燃料元件卡住 | |
| jamming of shutdown rod | 停堆棒卡住 | |
| jamming station | 干扰发射机 | |
| jamming transmitter | 干扰发射机 | |
| jamproof | 防干扰的 | |
| jar | 振动 | |
| jar test | 瓶试验,烧杯试验 | |
| jar-proof | 防振的 | |
| jargon | 术语,行话 | |
| jarring motion | 振动,颤动 | |
| javelin-shaped fuel rod | 标枪状燃料元件棒(英国唐瑞快堆) | |
| jaw | 钳口,颚 | |
| jaw clutch | 颚式离合器 | |
| jaw coupling | 爪盘联轴节 | |
| jaw crusher | 颚式破碎机 | |
| jaw crushing | 颚板破碎 | |
| jayrator | 移相段 | |
| jazz the motor | 强化发动机 | |
| jccd | pn结型电荷耦合 | |
| jel | 凝胶,冻胶 |

