当气门杆直径磨损量超过（)时，应报废。

A.5%

B.10%

C.12%

D.15%

A.5%

B.10%

C.15%

D.20%

A.2%

B.4%

C.6%

D.10%

A.5%

B.10%

C.15%

D.20%

A.2%

B.15%

C.5%

D.2%

A.有裂纹

B.轮槽不均匀磨损达5mm

C.轮槽壁厚度磨损达原厚度的15%

D.轮槽底部直径磨损量达钢丝绳直径的40%

A.5%

B.8%

C.10%

D.12%

A.用20倍放大镜观察表面有裂纹及破口

B.挂绳处断面磨损量超过原高的10%

C.心轴磨损量超过其直径的5%

D.表面有碰损

E.开口度比原尺寸增加15%