back flow 回流逆流back mixing 反混back pressure 背压力back reaction 逆反应back substitution 回代backpressure 反向压力；反压力backscattering technique 逆散射法backstreaming 逆流backward difference 后向差分backward motion 逆向运动backward precession 逆旋进backward thrust 逆推力backward wave 逆向行波backwash 后涡流backwater 回水backwater curve 回水曲线backwater distance 回水距离backwater function 回水函数backwater surface 回水面backwater surge 回水浪baer law 巴尔定律baeyer strain theory 贝耶尔应变理论balance 平衡balance condition 平衡条件balance equation 平衡方程balance force 平衡力balance weight 平衡锤balanced load 平衡负载balanced system of force 平衡力系balancing 平衡balancing force 补偿力balancing in situ 本机平衡balancing machine 平衡试验机balancing method 平衡法balancing speed 平衡速率ball support 球面支座ballast 压载物ballistic 弹道的ballistic coefficient 弹道系数ballistic constant 弹道常数ballistic curve 弹道曲线ballistic deflection 弹道偏差ballistic error 冲惑差ballistic pendulum 冲悔ballistic rocket 弹道火箭ballistic trajectory 弹道轨迹ballistic wave 弹道波ballistics 弹道学balloon 气球balloon borne rocket 气球发射火箭banded structure 带状结构bandwidth 带宽bank 侧向倾斜bar 巴bar construction 棒构造baric topography 气压形势baric wave 气压波barocline 斜压baroclinic fluid 斜压铃baroclinity 斜压性barodynamics 重结构力学barograph 气压计barometer 气压计barometric altitude 气压高度barometric column 气压柱barometric gradient 气压梯度barometric height 气压高度barosphere 气压层barotropic equation 正压方程barotropic equilibrium 正压平衡barotropic flow 正压流barotropic fluid 正压铃barotropic instability 正压不稳定barotropy 正压性barrel vault 圆柱壳barrier 障碍barycenter 重心barycentric 重心的barycentric coordinates 重心坐标barycentric system 重心系barycentric velocity 重心速度base flow 底流base pressure 底面压力basic equation 基本方程basic load 基本载荷basin 硫basset force 巴塞特力bathyal region 半深海区bauschinger effect 包辛格效应beach 海岸beam 梁beam axle 梁式轴beam balance 杠杆秤beam column 梁杆beam structure 梁结构beam supported of both ends 简支梁beam truss 桁架梁beam with varying section 变截面梁bearing 方位；轴承bearing capacity 承载力bearing friction 支承摩擦bearing friction loss 轴承摩擦损失bearing line 方位线bearing load 轴承荷载bearing power 承重能力bearing pressure 支承压力bearing strain 承载应变bearing strength 承载强度bearing stress 承载应力bearing surface 支承面beat 差拍beat frequency 拍频beat period 拍频周期bed load 推移质beginning of curve 曲线起点behavior 行为bell pressure gage 钟型压力计bell type manometer 钟型压力计bellows 波纹管belt tension 皮带张力bend test 弯曲试验bending 弯曲bending center 弯曲中心bending fatigue limit 弯曲疲劳极限bending line 弯曲线bending load 弯曲载荷bending moment 弯矩bending moment density 弯矩密度bending moment diagram 弯矩图bending radius 弯曲半径bending rigidity 抗弯刚度bending strain 弯曲应变bending strength 抗弯强度bending stress 弯曲应力bending test 弯曲试验bending vibration 弯曲振动bending wave 弯曲波beneding stress 挠应力bernoulli constant 伯努利常数bernoulli equation 伯努利方程bessel function 贝塞耳函数beta ratio 比压biaxial stress 双轴向应力bifurcated shock 分岔激波bifurcation 分支bifurcation point 分支点biharmonic function 双谐函数bilateral 双向的bilateral constraint 双边约束billow 大浪bimoment 双力矩bimotor 双发动机飞机binary collision 双碰撞binary diffusion coefficient 二元扩散系数binder 结合剂binding agent 结合剂binding energy 结合能binding force 结合力bingham body 宾汉物体bingham flow 宾汉怜bingham fluid 宾汉铃bingham model 宾汉模型binodal seiche 双节点驻波振荡biological similarity 生物学相似性biomechanics 生物力学biomechanics of bone 骨力学biomechanics of sports 运动生物力学biorheology 生物龄学biot savart law 毕奥 萨伐尔定律biplane 双翼飞机bipolar coordinates 双极坐标birefringence 双折射bivector 双矢black body 绝对黑体；黑体black body radiation 黑体辐射blade 叶片blade efficiency 叶片效率blade exit angle 叶片出口角blade grid 叶栅blade inlet angle 叶片入口角blade loss 叶片损失blade outlet angle 叶片出口角blade pitch 叶片距blading 叶片装置blast 送风blast nozzle 喷气嘴blast of wind 阵风blast pressure 风压blast tuyere 风口blast volume 风量blasting 爆破blasting chamber 起爆室blasting efficiency 爆破效率blimp 软式飞艇blocking phenomenon 堵塞现象blood flow 血流blood visco elasticity 血液粘弹性blood viscosity 血液粘度blower 吹风器blown flap 吹气襟翼bluff body 钝体blunt body 钝头体body centroide 本体极迹body fixed system 物体固定坐标系body force 体力body of revolution 旋转体boger fluid 保格铃boiling 沸腾boiling point 沸点boiling temperature 沸点温度boltzmann constant 玻耳兹曼常数boltzmann distribution 玻耳兹曼分布boltzmann factor 玻耳兹曼因子boltzmann h theorem 玻耳兹曼 h 定理boltzmann law 玻耳兹曼定律boltzmann transport equation 玻耳兹曼输运方程bolus flow 团流bond energy 结合能bond strength 附着强度bonding force 耦合力boost 升压booster 加速器bootstrap dynamics 靴袢动力学border 边缘borderline 边线bore 内径borehole 钻孔born green equation 玻陡窳址匠眺born von kormon boundary condition 玻斗肟 呓缣跫bottom chord 底弦bottom current 底流bottom standing wave 底层驻波bottom velocity 底层速度bouguer wave number 布格波数bounce 回跳bound energy 束缚能bound state 束缚态bound vector 束缚矢量bound vortex 约束涡boundary 边界boundary collocation 边界配置boundary condition 边界条件boundary effect 边界效应boundary element method 边界元法boundary friction 边界摩擦boundary layer 边界层boundary layer control 边界层控制boundary layer equation 边界层方程boundary layer flow 边界层怜boundary layer method 边界层法boundary layer region 边界层区域boundary layer separation 边界层分离boundary layer thickness 边界层厚度boundary layer transition 边界层转捩boundary method 边界解法boundary of the air mass 气团的边界boundary part 边界部分boundary point 边界点boundary