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.
As soon as we were inside, the rain began to bucket down.我们刚进屋，大雨便倾盆而下。A moment or two later champagne in an ice-bucket materialized beside them.片刻之后，他们身边出现了一只装着香槟的冰桶。He felt a sudden compulsion to drop the bucket and ru...
The diaphragm vibrates , thus setting the air around it in motion.膜片振动,这使得周围的空气也动荡起来.The diaphragm draws air into the lungs.横膈膜向下运动让空气进入肺部.A portion of the cardia is demonstrated above the diaphragm.膈上发现部分贲门....