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热门标签: 硬度
【单选题】刀具切削部分材料的硬度要高于被加工材料的硬度,其常温硬度应在( )。
铝及铝合金硬质阳极氧化膜层硬度检验,一般硬度为HV≥250。( ) 选项: A:正确 B:错误
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为什么不同中药材有不同的硬度()
以下哪个不是大气腐蚀的影响因素?() 选项: A、空气湿度 B、温度 C、材料硬度 D、大气成分
健牛瘤胃触诊硬度()。 选项: A.上软下软 B.上软下硬 C.上硬下软 D.上下软硬大体相似 E.上硬下硬
下面说法正确的是() 选项: A:A.布氏硬度不可测薄件 B:B.洛氏硬度不可测薄件 C:C.维氏硬度不可测薄件 D:D.布氏硬度洛氏硬度维氏硬度都可测薄件
硬度的表述方法有布氏硬度、洛氏硬度、维氏硬度,常用的是维氏硬度。
下面说法正确的是( )A、布氏硬度不可测薄件B、洛氏硬度不可测薄件C、维氏硬度不可测薄件D、布氏硬度洛氏硬度维氏硬度都可测薄件
关于洛氏硬度试验,以下说法错误的是( ) 选项: A、洛氏硬度各标尺测得的硬度值彼此没有联系 B、洛氏硬度标尺有九种,常用的有三种 C、洛氏硬度试验所用的压头只有一种 D、以测量压痕深度表示材料的硬度值
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