痛风石可存在于（）
A.关节
B.皮肤
C.肺脏
D.关节软骨
E.肌建
参考答案：A, D, E
（）the project in time, the staff were working at weekends.
A. Competing
B. Having completed
C. To have completed
D. To complete
钢筋绑扎是钢筋工程的一个（）
A、工作过程
B、工序
C、操作
D、动作
