采用反吹法测定高纯氩气中大分子碳氢化合物,能够达到准确、快速测量高纯气体中大分子碳氢化合物的目的.Column switching - back flushing technique can realize accurate and fast measurement of macromolecular hydrocarbons in high - purity argon....
This policy has led to a dramatic increase in our prison populations.这项政策已经让我们监狱的囚犯人数激增。Yesterday he changed his tune, saying the fare increase was experimental.昨天他变卦了，说提价只是试行。WHO warned that hookah smoke could also incr...