A:making; Misunderstood
B:made;Being misunderstood
C:has made;Be misunderstood
D:had nade; Having been nisunderstood
用浓氯化铵溶液处理过的舞台幕布不易着火。其原因是()①幕布的着火点升高②幕布的质量增加③氯化铵分解吸收热量,降低了温度④氯化铵分解产生的气体隔绝了空气