是一种值得推广的新型沥青路面下面层级配。
Large flicker of eastern North America with a red neck and yellow undersurface to wings and tail.北美洲东部大型金翼啄木鸟,颈红色,腹部、翅膀和尾巴为黄色。
It provides precise dimensional tolerances, enhanced surface finishes and no undersurface cavities.该技术可以实现精确的尺寸公差,提高表面抛光度,避免表面下空洞。