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【多选题】
Given two collection objects referenced by col1 and col2，which of these statements are true？（）A.
The operation col1.retainAll（col2） will not modify the col1 object.
B.
The operation col1.removeAll（col2） will not modify the col2 object.
C.
The operation col1.addAll（col2） will return a new collection object， containing elements from both col1 and col2.
D.
The operation col1.containsAll（Col2） will not modify the col1 object.
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反馈参考答案：
举一反三
【简答题】应用市场法进行资产评估必须具备的前提条件有（ ）。
【简答题】等温面与等温线的特点？
【单选题】The dichotomy postulated by many between morality and interests, between idealism and realism, is one of the standard clichēs of the ongoing debate over international affairs.
A.
division into two parts
B.
combination of two parts
C.
disparity
D.
contradiction
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