backingn.支持;背衬;伴奏动词back的现在分词.
backn.后面;背脊;靠背;后背;后卫vt.支持;后退adv.向后地adj.向后的;后面的;偏远的;过时的;积欠的
Back to back import first输入为先对开信用证
backscattered ultraviolet反向散射紫外
backstep welding sequence分段退焊次序
back mandrel thrustwasher背轴顶入垫圈
backscatter cross section反向散射截面
back coated computer tape背面涂覆式计算机磁带
backfilled printed poplin单面浆印花府绸