门座式起重机滑轮槽底的磨损量超过钢丝绳直径的（）%时，需要更换。
A、15
B、20
C、25
参考答案：A
Wu Juping was presented with her award at a ceremony which ______ the bravery of the woman
who had saved a baby falling from the tenth floor . [ ]
A. recognized
B. witnessed
C. approved
D. distinguished
不安抗辩权
