管件上的螺纹一般应是() ["圆柱螺纹","圆锥螺纹","方螺纹","上述各种都可以"]
The Eisteddfod is a(n)()festival of poetry,music and other arts. ["English","Scottish","Welsh","Irish"]
常见的阀门与管道连接的方式有() ["焊接","螺纹连接","卡套连接","法兰连接","夹箍连接"]
油墨传递行程
现实美是美的客观存在形态,艺术美却只是这种客观存在的()的产物,是美的创造性的反映形态。()是艺术美的唯一的源泉,属于()的范畴,即第一性的美;艺术却是属于社会意识的范畴,即第二性的美。
什么是教育性教学原则?