loose knot是什么意思

用法例句

Wood turpentine oil ,flotation oil and distillation residue obtained from pine stumps were analyzed by GC/MS,18 components of wood turpentine oil are separated- The main components are monoterpenes, of which 56- 30% is α-pinene.

用气相色谱-质谱联用仪分析鉴定了我国浸提松香厂生产的木松节油、选矿油和釜残油的化学组成及其相对含量。