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1·It is certain to avoid cooling point in the channel, in case some outflow with high boiling point condensate in halfway to affect quantitative results.

务必避免通道中有冷却点存在，否则会使一些高沸点流出物在中途冷凝而影响质谱定量结果。

2·The mass flow rate and position of film outflow are less effective on the flow field in the channel.

气膜孔出流流量和出流位置对通道内流场的影响很小。