I thought: 'This cannot be happening, somebody must be playing a joke'.我想：“这不可能发生，肯定是谁在开玩笑。”Train doors have handles on the inside. They are stiff so that they cannot be opened accidentally.火车车门内侧有把手。把手都很紧，防止意外...
Activity of compound bactericide is determined by biological method, synergistic action is judged from multiplicatin factor.以管蝶扩散二剂量法测定复配后的杀菌剂的活性,以增效倍数来判断复配后的杀菌剂是否具有增效作用.Bactericide Chemical compound which has the proper...