骨细胞具有一定的溶骨和成骨作用，参与调节钙、磷平衡。
参考答案：对
( )的开挖施工设备适宜于开挖软岩，不适宜于开挖地下水较多，围岩不太稳定的地层。
A．全断面掘进机
B．独臂钻
C．天井钻
D．TBM掘进机
As soon as the exams were over, the students all went their ______ ways.
A．homely
B．perspective
C．respective
D．diverted
