用来测定发动机输出功率的仪器叫做（）。
参考答案：测功仪
Which of the following statements represents a major principle of chronic pain management
A．A physiologic approach is most effective.
B．A psychological approach is most effective.
C．A pharmacologic approach is most effective.
D．A multidisciplinary approach is most effective.
《建筑基坑支护技术规程》（JGJ120-99）规定地下连续墙的构造钢筋宜采用（）级钢筋，同时直径不宜小于（）mm。
A．HRB335，20
B．HPB235，20
C．HPB235，16
D．HRB335，16
