【判断题】
A. 对
B. 错
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B
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钳工基本操作包括划线、錾削、锯割、锉削、钻孔、扩孔、锪孔、铰孔、攻螺纹、套螺纹、装配、刮削、研磨、矫正和弯曲、铆接、粘接、测量以及作标记等
A. 对
B. 错
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机器设备(或产品)使用中的调试和维修是钳工的工作主要范围之一
A. 对
B. 错
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钳工是利用工具和设备仪器对工件进行切削加工或进行机器设备和部件的装配及维修等的操作
A. 对
B. 错
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钳工具有使用工具简单、加工多样灵活、操纵方便和适应面广等特点
A. 对
B. 错
【判断题】
目前有各种先进的加工方法,由于钳工手工作业不能保证产品质量,很多工作不需要钳工来完成,
A. 对
B. 错
【判断题】
钳工常用的设备有钳工工作台、台虎钳、砂轮机、钻床、手电钻等
A. 对
B. 错
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钳工完全手工作业,不需要常用的设备
A. 对
B. 错
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钳工常用的手用工具有划线盘、錾子、手锯、锉刀、刮刀、扳手、螺钉旋具、锤子等
A. 对
B. 错
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钳工工作台简称钳台,用于安装老虎钳,进行钳工操作。有单人使用和多人使用的两种
A. 对
B. 错
【判断题】
台虎钳是钳工最常用的一种夹持工具。凿切、锯割、锉削以及许多其他钳工操作都是在台虎钳上进行的
A. 对
B. 错
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钳工常用的台虎钳有固定式和回转式两种
A. 对
B. 错
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为了延长台虎钳的使用寿命,台虎钳上端咬口处用螺钉紧固着两块经过淬硬的钢质钳口。钳口的工作面上有斜形齿纹,使零件夹紧时不致滑动
A. 对
B. 错
【判断题】
台虎钳夹持零件的精加工表面时,应在钳口和零件间垫上纯牛皮或橡皮等软材料制成的护口片(俗称软钳口),以免夹坏零件表面
A. 对
B. 错
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钻床是用于孔加工的一种机械设备,它的规格用可加工孔的最大直径表示,其品种、规格颇多。其中最常用是立式钻床(立钻)
A. 对
B. 错
【判断题】
手电钻主要用于钻直径 12 mm以上的孔。常用于不便使用钻床钻孔的场合
A. 对
B. 错
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根据用电安全条例,手电钻额定电压只允许220V。手电钻携带方便,操作简单,使用灵活,应用较广泛
A. 对
B. 错
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根据图样要求在毛坯或半成品上划出加工图形、加工界限或加工时找正用的辅助线称为划图
A. 对
B. 错
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台式钻床具有较大的灵活性,能适应各种情况的钻孔需要。由于它的最低转速较高(一般不低于400r/min),适用于锪孔、铰孔
A. 对
B. 错
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操作钻床时不可带手套,袖口必须扎紧
A. 对
B. 错
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划线的目的是划出清晰的尺寸界线以及尺寸与基准间的相互关系,既便于零件在机床上找正、定位,又使机械加工有明确的标志
A. 对
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平面划线是在零件的一个平面或几个互相平行的平面上划线。立体划线是在工作的几个互相垂直或倾斜平面上划线
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划线工具有划线平台、划针、划线盘与划规
A. 对
B. 错
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高度游标尺,实际上是量高尺与划针盘的组合。划线脚与游标连成一体,前端镶有硬质合金,一般用于未加工面的划线
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一般 V 形铁都是两块一副,即平面与 V形槽是在一次安装中加工的。V形槽夹角为 90°或 100°。V形铁也可当方箱使用
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样冲用于划好的线条上打出小而均匀的样冲眼,以免零件上已划好的线在搬运、装夹过程中因碰、擦而模糊不清,影响加工
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平面划线是用划线工具将图样按实物大小 1∶2划到零件上去的
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choose five___
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B. DES————————insercure
C. SDES———————legacy
D. SHA-1———————legacy
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Drag the recommendation on the left to the Cryptographic algorithms on the right, Options will be used more than once.___
A. Avoid——————————————DES,MD5
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【多选题】
Which two are valid types of vLans using PVLANS ?___
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