【单选题】【消耗次数：1】
下列气相色谱操作条件中，正确的是
①
载气的热导系数尽可能与被测组分的热导系数接近
②
使最难分离的物质在能很好分离的前提下，尽可能采用较低的柱温
③
实际选择载气流速时，一般低于最佳流速
④
检测室温度应低于柱温，而气化温度愈高愈好
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