Which one of the following statements regarding osteocytes is FALSE

A．They communicate with each other via haversian canals

B．They live for a long time

C．They possess long cytoplasmic processes

D．They are housed in their own lacunae

E．Osteocytes communicate with each other via narrow cytoplasmic processes that extend through canaliculi.

脚手架主节点处必须设置一根横向水平杆，用直角扣件扣接在纵向水平杆上且严禁拆除。主节点处两个直角扣件的中心距不应大于（）mm。

A．80

B．100

C．120

D．150