still head是什么意思

用法例句

Simulation and optimization for catalytic cracking primary fractionation column expanding revamp;

催化裂化装置主分馏塔扩能改造模拟及优化分析

Influence factors on the esterification fractionation control and its improvement measure;

酯化分馏控制的影响因素及改进措施

Process simulation and analysis of main fractionation column in delayed coking unit;

延迟焦化主分馏塔工艺模拟与分析(英文)

Under ordinary pressure, the experiment of simple distillation and fractional distillation is studied.

通过常压下简单蒸馏与分馏的实验研究,阐明双组分体系中温度平台与组分含量、沸点差值之间的关系。