对不合格品采取返工，降级、报废等措施都属于对不合格的（）。
A、让步
B、纠正
C、纠正措施
参考答案：B
The abacus _____ in _____ century by Chinese. [ ]
A. invented; six
B. was invented; the sixth
C. invented; the sixth
启宫丸首选治疗
A.肝郁不孕
B.痰湿不孕
C.肝肾不足不孕
D.肾虚不孕
E.以上都不是
