bxdboxed 装箱的bn.字母B；第二；B调；乙等；像字母B的东西B-instruction变数指令B-Y amplifier黑白亮度放大器B.S.screensn.英国标准筛B. mucrunatus拟松材线虫B cell of islet胰岛B细胞B. Scutellata具条实蝇B. Cucurbitae瓜实蝇bjacent support下面的支承B-Iymphocytes非胸腺依赖性细胞B ignore A gate[计] 与A无关的B门