Research on influence of diameter ratio and length-diameter ratio on structural integrity of solid propellant under temperature loading;
温度载荷下装药内外径比和长径比对结构完整性影响的规律研究
Influence of radius of rounded corner of stepped shafts and radius ratio on fatigue life of shafts subjected to torsion;
扭转条件下过渡圆角半径及径比对圆轴疲劳寿命的影响
The fatigue life of a circular shaft with different circular arc transition radius and radius ratio was studied.
在岛津EHF-EM100kN新型电液伺服疲劳实验机上研究了40Cr在扭转疲劳载荷下的超低周疲劳断裂问题;并绘制寿命随圆角半径和径比变化的曲线图。
length diameter ratio
长径比（长度与直径之比）
How much is the diameter of the sun longer than that of the earth ?
太阳的直径比地球的直径长多少?
The diameter of the sun is more than one hundred times longer than that of the earth .
太阳的直径比地球直径长一百多倍。
The diameter of Mars is slightly over half that of the earth.
火星的直径比地球的半径稍大些。
ratio of the pole spacing to the bore diameter of the pole pieces
极靴的间距与孔径比
train athletes for track-and-field competition.
为田径比赛训练运动员
Johnson and Aouita blazed their way to the top of track and field.
约翰逊和阿乌伊塔各辟蹊径，跻身田径比赛榜首。
Talking about the Strategy of Athletics Development in Our Country from 10th National Games;
从十运田径比赛谈我国田径运动的发展对策
THINKING ABOUT THE TREND OF THEINTERNATIONAL ATHLETIC LEVEL FROM THE DISTRIBUTIONOF GOLD MEDALS IN THE OLYMPIC ATHLETIC COMPETITION;
奥运会田径比赛金牌分布及田径运动发展方向
Comparative analyses and research of track and field achievements at 9th and 10th National Games in China;
第九、十届全运会田径比赛成绩的比较分析研究
The Comparative Analysis of Track and Field Events Results for Secondary School Students in Inner Mongolia Autonomous Region in the last decade
近十年内蒙古中学生田径比赛成绩对比分析
Joe and I are going to run in the race.
乔和我打算参加田径比赛。
She be go to be a timekeeper at the track meet
她将在田径比赛中担任计时员
Track and field games are often held in the open air.
田径比赛大多都是在户外进行的。
The ship was heading straight into the Caribbean Sea.
船只径直驶入加勒比海。
gravel-to-sand median diameter ratio
砾石-地层砂直径中值比
bilge-radius to beam ratio
舭部半径与水线宽度比
the ratio of the focal length to the diameter of a (camera) lens system.
相机镜头直径焦距比。