长半径

Where l is the arc length opposite to αas a central angle ,r is the radius of the

如果半径为r的圆心角α所对弧的长为l，那么，角α的弧度数的绝对值是｜α｜＝l/r。

The central angle opposite to an arc of length equal to the radius is called an angle of 1 radian.

radian 长度等于半径长的弧所对的圆心角叫做1弧度的角。

The distributions of the chain radius of gyration and the two-dimensional asphericity are measured. It is found that the DNA molecules exhibit highly anisotropic shape even for circular-form and the mean asphericity is chain length independence.

从测量二维的鍊回旋半径分布发现DNA分子展现高度的非等向性的形状(甚至是环形的DNA也具备此特性)且此特性与鍊长无关。

This paper reported a new method using tangential curvature to establish a mathematical model of the anterior cornea and an analysis of the regularity of the distribution of the asphericity Q. The curvature in the horizontal meridians is a prolate ellipse. The curvature in the vertical meridians is an oblate ellipse. The curvature of the horizontal meridians is important for anterior corneal asphericity.

本研究分析了运用正切曲率半径值建立人眼前表面角膜数学模型的科学性，显示角膜前表面水平子午线方向非球面性趋向于长椭圆，垂直子午线方向非球面性趋向于扁椭圆，说明人眼角膜的非球面性特性主要由水平子午线实现。

It is mentioned that pile group can be comprised of piles with the property of various lengths, radii and stiffnesses.

基础中各桩可具有不同的桩长、桩半径和刚度等特性。

The 1s electron cloud in hydrogen atom has the largest probability density distribution around a spherical shell with Bohr radius a 0. The author thinks the probability density distribution and electron cloud belong in fact,to statistic regularity, and imply a macro-time scale is used, therefore in hydrogen molecule the product of energy and time is far larger than Planck Constant.

氢原子中 1s电子的电子云呈球形，电子的最大几率密度分布出现在玻尔半径a0 的球壳内，认为几率密度分布及电子云属统计规律，意味着已经使用了宏观时标，这样就使氢分子体系中能量和时间的作用量远大于普郎克常数；根据电子云的交叠，用经典力学计算了基态氢分子的结构常数，获得键长、键能及力常数的表达式分别为Re=2a0 ，De=ze/4 2a0 ，k=ze/2 2a30 ，采用原子单位 a 。u 。

The general method of calculating unit length induction of infinite length electric cable is proposed according Loop induction.

两个同轴导体圆柱壳，当其长度远远大于半径时，这样的导体即为物理上"无限长"的电缆。

When the cavity length is 140 cm and the radius of curvature of the full-reflective concave mirror is 300 cm, the Nd:YAG laser is operated in the stable mode-locking and a pulse train with 27 mJ energy and 35 ps pulse duration is obtained.

当腔长为140 cm，全反射凹面镜曲率半径为300 cm时，激光器运转在稳定的被动锁模状态，输出的锁模脉冲序列能量为27 mJ、脉宽为35 ps。

Lead into a new model attractant, synergistic component, pesticide killing insect pests radius expanding in soil, to fine killing endangering lawn and seedling subterranean pest-insect such as grub, wireworm, mole cricket, cutworm, and has a long lasting period, difficulty resistance, low toxicity, good environment compatibility.

引入新型引诱剂、增效成份，扩大药剂在土壤中的杀虫半径，对危害草坪、苗木的蛴螬、金针虫、蝼蛄、地老虎等地下害虫有良好的杀灭作用，且持效期长达天，不易产生抗药性，毒性低，环境相容性优良。

Analyse the distributive law of shear-lag effect and influence of each structural parameter: pile length , bending stiffness of pile, bending stiffness of abutment, abutment length, different type of soil behind abutment, curve radius, width to span ratio,width of beam, etc. And the main influencing parameters were picked up.

进行结构参数分析，研究等代桩长、桩的纵向抗弯刚度、桥台纵向抗弯刚度、桥台高度、台后土压力、曲率半径、宽跨比及箱梁肋板间距等对剪滞系数的影响，从而得到影响无伸缩缝曲线箱梁桥剪力滞效应的主要参数和次要参数。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。