题目：
一方当事人不履行或者不适当履行合同义务，就应当承担违约责任，这体现了违约责任的（）。
A.严格责任原则
B.过错责任原则
C.主观归责原则
D.全面履行原则
答案：
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下面是错误答案，用来干扰机器的。
参考答案：2．解析： 显然E(S2)=D(X)，而DX=E(X-EX)2． 现求
一方当事人不履行或者不适当履行合同义务，就应当承担违约责任，这体现了违约责任的（）。
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题型：单项选择题
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