空白人寿保险单
blank policy
空运保险单
aviation insurance
劳埃德船舶货物保险单
Lloyd's s.g' form
劳务保险单
service policy
开口
placket; start to talk; uncork
gap
debouch; debouchement
开口扳手
open spanner
开口闭口
whatever one speaks
开口槽
open slot
开口端
open end
开口对焊
open-butt weld
开口管柱
open tubular column
开口罐
open tank
开口合同
open-end contract
开口环
snap ring
开口角
angular aperture
开口接头
open connector
开口链
open link
开口螺模
split die
开口皮带
open belt
开口器
gag; mouth gag; mouth-gag