从临床实用角度疼痛可分为____、____和_____。
参考答案：中枢性、外周性、心因性
____ , people in the north have noodles as their main food while thesoutherners are fond of rice in China. [ ]
A. In common
B. In general
C. In total
D. In return
侧滑台的主要部件包括（）。
A、举升器
B、回位弹簧
C、滑动板
D、传感器
