镀铝钢片及其它种类钢片的抗腐蚀性能比较
Comparison of various resistance of aluminized steel & other kinds of steel
三种钢的氧化特性
oxidation properties of three kinds of steel
安老院的种类
types of residential care homes
初类﹝种﹞的碰撞
collision of the first kind
次类﹝种﹞的碰撞
collision of the second kind
氮源的种类
the variety of nitrogen source
关于蕈菌种类的评估
The Numbers of Mushnoom Species