遇易燃液体火灾事故时,如果面积很小,一般用雾状水扑灭即可。
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某物质按一级反应进行分解.已知反应完成40%需时50min,试求(5)以s为单位的速率常数;(2)完成80%反应所需时间.
当材料的孔隙率增大时则其密度___,表观密度___,强度降低。
Planned change is often thought to be the best approach to kale in organizations. Can unplanned change ever be effective? Explain.