【判断题】热固性塑料加热后软化,冷却后坚硬,固化后再加热能再成形。
【单选题】He was regarded as such a _____ student that all of the teachers believed that his future would be bright. [ ]
【单选题】He was widely regarded as a ______ man because he revealed daily his distrust of human nature and human motives.
【简答题】刺激强度等于______的刺激称为阈刺激,刺激强度高于______的刺激称为阈上刺激。