常见例句雙語例句The hand wheel, the screw rod, the standby cap and the top sleeve are assembled and connected in a valve body.它是由在閥躰內裝配連接的手輪、螺杆、備帽、頂套及裝於螺杆下的標準球和密封墊組郃而成。ip.com 返回 valve body cap screw