An experimentalsetup of travelling magnetic field excited by supper power permanent magnet was designed, which has obviously refine function for metal solidification structure.
开发了一套以强磁性永磁体为驱动介质的行波磁场发生器,该装置具有使金属凝固组织微细化的作用。
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When experimental populations are setup under simple laboratory conditions, the predator often exterminates its prey and then becomes extinct itself, having nothing left to eat.
Fifteen chimps and 24 children were introduced to the same experimentalset-up: a room containing both a single end of rope and a doubled-over rope with two available ends.