单项选择题

客车轴承磁粉探伤时，通过轴承外圈、内圈实物试块上（）和轴承滚子实物试块上（）圆形人工缺陷的显示验证磁场方向。

A.Φ10H7/s6、Φ5H7/s6
B.Φ5H7/s6、Φ10H7/s6
C.Φ8H7/s6、Φ5H7/s6
D.Φ10H7/s6、Φ10H7/s6

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单项选择题

A.30min～45min
B.40min～45min
C.40min
D.30min

单项选择题

A.0.2mL/100mL～6.0mL/100mL
B.1.0mL/100mL～1.2mL/100mL
C.1.2mL/100mL～3.0mL/100mL
D.1.2mL/100mL～2.4mL/100mL

单项选择题

A.0.2mL/100mL～6.0mL/100mL
B.1.0mL/100mL～1.2mL/100mL
C.1.2mL/100mL～3.0mL/100mL
D.1.2mL/100mL～2.4mL/100mL