The study shows that the classic warning signs of heart attack are ______.
A. not typical in women patients
B. obvious in all the patients with heart disease
C. rarely found in both male and female patients
D. often seen a month or more before the attack
洛伦茨曲线越偏离右下角，反映市场集中程度越高。()
A. 正确
B. 错误
下列数据结构中，属于非线性结构的是
A. 循环队列
B. 循环队列
C. 二叉树
D. 带链栈
张伯伦认为，现实的市场既存在竞争因素，也存在垄断因素，介于完全竞争和纯粹垄断之间，形成了“垄断竞争”格局。()
A. 正确
B. 错误
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