Northern winter indoor heating can be the normal construction, if the temperature does not guarantee a good idea to test a small area.

北方冬季室内有暖气可正常施工，如果温度不能保证，最好先进行小面积试验。

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The components of light benzene and purified benzene are separated using the same packed column in the condition of program raising temperature and quantified using direct area normal method.

用同一填充柱在程序升温条件下，分离轻苯及精制苯中各组份，并用直接面积归一法进行定量，苯系相对误差为0.94%。

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