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二 选择题16 为保证试样中心线垂直防止两端顶住,试样需离螺孔底部退出一,二牙,是为了避免产生________.(1)附加力(2)剪切力(3)非轴向力17 热电偶安装时必须将热端____表面.(1)附在试样(2)紧贴试样(3)粘在试样18 为防止炉壁热辐射,热电偶热端必须用_____缠绕包住.(1)石棉布或耐热玻璃棉带(2)粘胶带(3)黑胶带19 当试样计算长度等于或大于100mm时,应在______各绑一支热电偶.(1)试样两端(2)试样中间和上端(3)试样两端和中间20 为避免影响蠕变变形测量精度,热电偶的安装不能触及____.(1)试样中心(2)变形测量机构(3)夹头21 蠕变试验引伸计的安装应保证____.(1)紧、重、平三个要求(2)垂直状态(3)与试样平行22 测量蠕变试验机的同轴度主要仪器用________.(1)镜式引伸仪或电阻应变仪(2)反向器(3)测轴仪23 借助于_____可以测定蠕变、持久试验
Two multiple-choice questions 16 To ensure that the centerline of the sample perpendicular to prevent both ends of the top, the sample need to exit from the bottom of the screw hole, two teeth, in order to avoid ________. (1) additional force (2) shear force ) Non-axial force 17 The thermocouple must be installed on the hot side ____ surface. (1) attached to the sample (2) close to the sample (3) stuck to the sample 18 In order to prevent heat radiation furnace wall, thermocouple (1) Asbestos cloth or heat-resistant glass wool tape (2) Adhesive tape (3) Black tape 19 When the calculated length of the sample is equal to or greater than 100mm, (1) Both ends of specimen (2) Middle and upper part of specimen (3) Both ends and middle part of specimen 20 In order to avoid affecting the measurement accuracy of creep deformation, the installation of thermocouple can not touch ____. (1) Center of specimen (2) Deformation measuring mechanism (3) Chuck 21 Creep test The extensometer should be installed ____. (1) Tight, Sample parallel 22 measuring the coaxiality of the creep testing machine ________ (1) mirror extensometer or resistance strain gauge (2) inverter (3) measuring instrument 23 by _____ can be determined Creep, long-lasting test