决定中心静脉压高低的主要因素是血容量及心脏排血功能。
参考答案：对
软件工程研究的内容主要包括：______技术和软件工程管理。
Which of the following is most likely to be considered a characteristic of an oligopolistic industry（）
A. Few barriers to entry.
B. Few economies of scale.
C. A great deal of interdependence among firms.
