当冲积扇临近油源区时，扇体中部的（）由于具有较好的物性，因此可以成为油气聚集的有利地带。
参考答案：砂砾岩
人的上臂以肩关节为枢纽，可做旋转，环转等各种动作．这说明关节在运动中起着（ ）
A．动力作用
B．杠杆作用
C．支点作用
D．固定作用
Project Quality Management must address the management of the project and the（） of the project. While Project Quality Management applies to all projects, regardless of the nature of their product, product quality measures and techniques are specific to the particular type of product produced by the project.
A.performance
B.process
C.product
D.object
