身体前几个节间沟内经常无背孔。
There are usually no dorsal pores in the first few intersegmental grooves.
无背衬的单面焊缝可评定有背衬的双面焊缝；
Welds made from one side without backing qualify welds made from both sides and welds with backing;
本文的工作为无背索斜塔斜拉桥的设计提供了参考。
The conclusions of this paper offer reference for the design of no back-stays & inclined pylon cable-stayed bridge.
应用推荐