无支撑平封头和盖板flat: adj. (flatter; flattest) 1.平 ...head: n. 1.头,头部,首。 2.头脑,才能;智力,想像力, ...cover: vt. 1.覆盖,遮蔽,包裹;戴帽子;包庇,隐蔽,掩盖; ...flat heads and covers, unstayed: 无支撑平封头和盖板flat unstayed circular head: 无支撑圆形平封头下载手机词典可随时随地查词查翻译