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2、下列几种直径、长度均相同的金属丝,受力稍微弯曲,去掉外力后,哪种金属丝的形变接近于弹性形变? The following kinds of wires with the same diameter and length are slightly bent under the force. After removing the external force, which kind of wire deformation is close to the elastic deformation?
A.细钢丝 Fine steel wire
B.细铁丝 Fine iron wire
C.细铜丝 Fine copper wire
D.细铝丝 Fine aluminum wire
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更多 “2、下列几种直径、长度均相同的金属丝,受力稍微弯曲,去掉外力后,哪种金属丝的形变接近于弹性形变? The following kinds of wires with the same diameter and length are slightly bent under the force. After removing the external force, which kind of wire deformation is close to the elastic deformation?A.细钢丝 Fine steel wireB.细铁丝 Fine iron wireC.细铜丝 Fine copper wireD.细铝丝 Fine aluminum wire” 相关考题
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金属材料的塑性形变是指()。
A.当外力去掉后仍然恢复原来形状的性质B.当外力去掉后产生永久变形不发生破坏的性质C.当外力去掉后产生永久变形发生破坏的性质D.当外力去掉后保留下的永久变形
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关于弹性形变的概念,下列说法中正确的是()A、物体形状或体积的改变叫弹性形变B、一根钢筋用力弯折后的形变就是弹性形变C、物体在外力停止作用后,能够恢复原来形状的形变,叫弹性形变D、物体在外力停止作用后的形变,叫弹性形变
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Which three of these are characteristics of UTP cable?()A、The wires in each pair are wrapped around each otherB、An insulating material covers each of the individual copper wires in itC、It comes in eight-pair wire bindlesD、EMI and RFI cause only limited degradation to signals running over itE、It comes in seven categoriesF、IT has an external diameter of approximately 0 28 inches
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金属丝在外力作用下发生机械形变时它的电阻值将发生变化,这种现象称为();固体受到作用力后电阻率要发生变化,这种现象称为()。直线的电阻丝绕成敏感栅后长度相同但应变不同,圆弧部分使灵敏度K下降了,这种现象称为()
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物体在外力作用下发生形变,撤去外力后形变立即完全消失的称为完全弹性。形变超过某一限度时,物体不能完全恢复原来状态,这种限度称为弹性极限,在这个范围内,外力和变形量之间成(),其比例系数k为弹性系数,4个实用弹性系数分别为弹性模量,(),体积模量,泊松比。
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金属丝在外力作用下发生机械形变时它的电阻值将发生变化,这种现象称()效应;固体受到作用力后电阻率要发生变化,这种现象称()效应。直线的电阻丝绕成敏感栅后长度相同但应变不同,圆弧部分使灵敏度K下降了,这种现象称为()效应。
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多选题Which three of these are characteristics of UTP cable?()AThe wires in each pair are wrapped around each otherBAn insulating material covers each of the individual copper wires in itCIt comes in eight-pair wire bindlesDEMI and RFI cause only limited degradation to signals running over itEIt comes in seven categoriesFIT has an external diameter of approximately 0 28 inches
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单选题The internal force of a material, which tends to resist deformation when subjected to external forces, is known as ().A
stressB
strainC
shear strengthD
ultimate tensile strength
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填空题金属丝在外力作用下发生机械形变时它的电阻值将发生变化,这种现象称()效应;固体受到作用力后电阻率要发生变化,这种现象称()效应。直线的电阻丝绕成敏感栅后长度相同但应变不同,圆弧部分使灵敏度K下降了,这种现象称为()效应。
考题
填空题在外力作用下,弹性体发生的形变,只改变物体的(),而它的()保持不变,这种形变叫()形变,简称().
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