panspermia是什么意思

用法例句

Frost heave causation and prevention in roadbed;

路基翻浆产生原因及防治

This paper analyzes the kinds and causations of concrete crack, puts forward specific methods to avoid cracking.

本文全面分析了砼裂缝的种类,产生原因,并对如何避免砼裂缝提出了具体方法。

Analysis of the causes of linear chromatism on the surface of the cold rolled stainless strip and its improvement measures;

冷轧不锈钢带条状色差产生原因及其改善

Study on the causes of cracks in mass concrete and prevention and treatment measures;

大体积混凝土裂缝产生原因及防治措施

Simple Analysis of Free Red-light Cingulum Caused in JZXC-480 Railway Circuit and Prevention;

浅析JZXC-480轨道电路空闲红光带的产生原因及预防措施

Types and reasons of ecotourism environmental problems;

试论生态旅游环境问题的类型及其产生原因

This paper discussion the multi cultures of physical education hide curriculum,and the reason for the developing and reforming the curriculum of physical education and health.

本文以社会学、文化学和心理学为依托将从体育隐蔽课程文化多元性的表现特点、产生原因以及在教育领域的发展前景和意义三大方面展开论述,以期对体育课程教学有所启发和指导。

The author will analyse the reasons of the wrong movement and figour out the measures to it.

就摆动腿摆动动作错误的产生原因进行了探讨 ,并对如何纠正错误提出了自己的见

A preliminary study on the causes of the natural disaster;

地球自然灾害发生原因初探

Study on the Cause of Trunk Bore s Spreading Occurrence to the Secondary Coniferous Forest;

天然次生针叶林蛀干害虫大发生原因

Progress of the Causes of Tomato Navel Rot;

番茄脐腐病发生原因的研究进展