单词	中孔--中心孔
释义	中孔；中心孔center hole
随便看	directivity directivity-- antenna directivity; antenna directivity characteristics directivity diagram directivity, directive property directivity factor directivity (for wtgs) directivity function directivity gain directivity index directivity index{ =di} directivity index of a sound source directivity of directivity of antenna directivity pattern directivity pattern diagram directivity reflectance directivty direct join direct jump direct keying device direct kick direct knead direct knead-- straight dough (method)