单项选择题

新凯恩斯主义最重要的前提假设是（）。 A. 非市场出清 B. 经济当事人的最大化原则 C. 价格弹性 D. 信息不完全

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单项选择题

Which of the following statements is correct?
A、An adverse direct material cost variance will always be a combination of an adverse material price variance and an adverse material usage variance
B、An adverse direct material cost variance will always be a combination of an adverse material price variance and a favourable material usage variance
C、An adverse direct material cost variance can be a combination of a favourable material price variance and a favourable material usage variance
D、An adverse direct material cost variance can be a combination of a favourable material price variance and an adverse material usage variance