C7损伤平面的关键肌为（）
A.小指展肌
B.肱三头肌
C.中指屈指肌
D.桡侧腕长伸、短伸肌
E.肱二头肌、旋前圆肌
参考答案：B
焊接场地禁止放易燃易爆物品，保证（）的照明和良好的通风。
A、良好
B、一般
C、足够
Which of the following theories assumes the main source of business cycle is most likely due to changes in technology and extemal shocks（）
A. Keynesian cycle theory.
B. Real business cycle theory.
C. New classical cycle theory.
