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【多选题】
以下说法正确的是A.
没有绝对的流变与突变。离开了流变，就无所谓突变
B.
影响安全的质划分出流变和突变的界限是很困难的，因为事物的发展总保持自身的 连续性
C.
不同物质层次的流变和突变有其不同的表现形式和质的规定
D.
某种具体的安全变化过程，在低层次可以称为突变，而在高层次则属于流变
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