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|| 直接取代
direct sum || 直和
direct switching in || 直接合闸，直接启动
direct system || 方向系统
direct tempering || 直接回火
direct transformation || 直接转变
direct transition || 直接跃迁
direct transmission || 正透射，定向透射
direct trigonometric function || 正三角函数
direct vision prisms || 直视棱镜
direct wave || 直达波
direct-air die casting || 低压铸造
direct-arc furnace || 直接电弧炉
direct-arc melting furnace || 直接电弧熔化炉
direct-arc-melting || 直接电弧熔炼
direct-axis || 直轴，纵轴
direct-axis component || 直轴分量，纵轴分量
direct-axis subtransient impedance || 直轴超瞬变阻抗，直轴次瞬变阻抗
direct-axis synchronous impedance || 直轴同步阻抗
direct-challenge system || 直接呼叫系统
direct-comparison method of measurement || 直接比较测量法
direct-couple driver triode || 直接耦合激励三极管
direct-couple twin triode || 直接耦合双三极管
direct-coupling triggering || 直接耦合触发
direct-current balancer || 直流平衡器，直流平衡发电机
direct-current biasing || 直流偏压
direct-current converter || 直流变换器，直流换流器
direct-current dynamo || 直流发电机，直流电机
direct-current electro-magnetic || 直流电磁泵(液体金属用)
direct-current linear variable differential transformer || 直流差动变压器[DC-DC LVDT]
direct-current motor || 直流电动机
direct-current transformer || 直流变流器，直流-直流换流器
direct-current transmission || 直流输电
direct-distance dialing || 直接长途拨号，用户长途拨号
direct-fire telescope || 指挥射击望远镜
direct-fired coil furnace || 直接式带卷加热炉
direct-fired heater || 直接火力加热器，直焰炉
direct-fired rotary drier || 直烧旋转干燥器
direct-gap semiconductor || 直接带隙半导体，直接能隙半导体
direct-imaging mass analyser || 直接成象质量分析仪
direct-line layout || 直线布置
direct-operated regulator || 直接作用式调节阀，自力式调节阀
direct-ratio || 正比
direct-ratio spectrophotometer || 正比分光光度计
direct-reading meter || 直读计，直读式仪表
direct-reading spectrometer || 直读分光计
direct-reverse switch || 正反向开关
direct-trip circuit-breaker || 直接跳闸断路器
directed bond || 定向键
directed graph || 有向图形
directed line segment || 有向线段
directed ray || 定向射线
directed set || 有向集
directing group || 定向取代基
directing point || 基准点
direction || 方向，方位
direction annexed traverse || 方向附合导线
direction control || 方向控制 方向控制
direction cosine || 方向余弦
direction distribution || 定向分布
direction field || 方向场
direction finder || 探向器，无线电罗盘，定向仪
direction focusing || 方向聚焦
direction indicator || 方向指示器，中心指示器
direction indicator lamp || 转向信号灯
direction indicator light || 示向灯
direction mark meter || 方位标仪
direction of fibre || 纤维方向
direction of search || 搜索方向
direction of slip || 滑移方向
direction of turning || 旋向
direction of wave propagation || 电波传播方向
direction of welding || 焊接方向(程序)
direction switch || 方向开关
direction theodolite || 方向经纬仪
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