bicycle freewheel是什么意思

网络释义

用法例句

Taking the PPM catalogue as the initial reference catalogue and using the central overlapping method with the iteration process, we obtained the position and proper motion of NGC7302 and high - precision positions and proper motions of 11 stars around the galaxy.

采用上海天文台佘山40cm折射望远镜所拍摄的6张底片，以PPM星表作为初始参考星表，按中心重叠法进行了归算，得到河外星系NGC7302的位置与自行，以及周围天区11颗星的高精度位置和自行，它们的标准误差均好于30mas和0。

Using the stellar proper motions reduced from the observational data of photographic plates taken with the 40 cm double astrograph of Shanghai Astronomical Observatory, the distribution parameters and membership probabilities of stars in the region of the open cluster NGC6530 are determined on the basis of the maximum likelihood principle and given in tabular form.

利用上海天文台40厘米折射望远镜照相观测资料所得出的恒星自行,按最大似然原理确定了疏散星团NGC6530天区内恒星的成员概率。

Carrying out a kinematical analysis of the Galaxy for proper-motion systems of the FK5 and Hipparcos, a large difference in proper motions between two systems is found, even if the precessional correction to the FK5 system has been considered.

针对地面FK5和空间依巴谷自行系统 ,采用银河系运动学分析方法发现 ,即使考虑了岁差改正的影响 ,两种自行系统之间仍存在很大差异。

In this paper,performance-based fire safety design concept was adopted to analyze the fire safety objective that the smoke evacuation system of Laoshan bicycle racing centre should achieve,fire scenarios were designed and the performance of natural smoke evacuation system was studied by using CFD techniques.

采用性能化防火设计思想,分析老山自行车馆大厅的排烟系统所应达到的安全目标,设计了可能发生的火灾场景,使用CFD技术研究自然排烟系统的性能,通过数值模拟给出发生火灾时的流场和温度分布,证实大厅自然排烟系统能够保证人员安全疏散,满足该建筑消防安全要求。

Was the injured riding bicycle at the time of accident?;

损伤部位、类型与骑/推行自行车的相关性研究

Design and experiment of snake-shaped spring shocker absorber in bicycle;

自行车蛇形弹簧减震器的设计与实验

Use of insulated iron powders in a bicycle permanent magnet electric motor;

绝缘铁粉在自行车永磁电动机中的应用

Application and outlook of magnesium alloys on motorcycles and bicycles;

镁合金在摩托车及自行车上的应用现状及前景展望

Analysis of man-machine relationship of bicycles and their improvement;

自行车的人机分析与改进

This paper is a study on relations between bicycles and urban form.

本文是一篇研究自行车与城市形态二者间相互关系的文章。

After changing the filter materials of the F301 recycling filter with sintered metal fiber filter media, the self-burning could be completely prevented,and fro.

由于PP装置系统活化剂遇空气可自行燃烧,导致F301循环气过滤器在每次更换滤袋时丙稀+PP过滤材料随之燃烧,危害很大。