属于颌面部间隙的有（）
A.咬肌间隙
B.颞间隙
C.颞下间隙
D.尖牙凹间隙
E.舌下间隙
参考答案：A, B, C, D, E
Which function is not served by building a prototype ( )
A．It takes the place of the final system
B．It assists in gathering software requirements
C．It assists in estimating the cost of the project
D．It is used as the foundation of the larger projects
电厂中使用的DDD—32B型仪表用于测量炉水、发电机冷却水、凝结水、化学除盐水等的（）。
A.含盐量
B.电导率
C.硅酸根
