【判断题】【消耗次数：1】
滚珠丝杆副的轴向间隙是工作时滚珠与滚道面接触点弹性变形引起的螺母位移量，它会影响反向传动精度及系统的稳定性。
①
正确
②
错误
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【判断题】
滚珠丝杆副的工作原理是：在丝杆和螺母的螺纹滚道中装入一定数量的滚珠，当丝杆与螺母相对转动时，滚珠可沿螺纹滚道滚动，并沿滚珠循环装置的通道返回，构成封闭循环，使滚珠循环地参加螺旋传动，保持丝杆与螺母之间的滚动摩擦。
①
正确
②
错误
【单选题】
滚珠丝杠螺母的特点（ ）
①
摩擦损失小，传动效率高
②
丝杠螺母之间预紧后，可以完全消除间隙，提高了传动刚度
③
摩擦阻力大，寿命短，精度保持好
④
不能自锁，由可逆性
随机题目
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Classification is a useful _____to the organization of knowledge in any field.
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means
②
approach
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mode
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manner
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Although the main characters in the fiction are so true to life, they are certainly _____.
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imagining
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imaginative
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imaginable
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imaginary
【单选题】
I was to have a trip abroad if _____.
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I had not been fired
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I was not fired
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my boss won’t have fired me
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I were not fired
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paid back
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paid for
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paid up
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paid off
【单选题】
She resorted to _____ when she had no money to buy foods for her children.
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have stolen
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steal
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stole
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stealing
【单选题】
Setting up a committee might be a way _____the project more efficiently.
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to be doing
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doing
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to do
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being done
【单选题】
A series of robberies _____recently.
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has been reported
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has reported
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have been reported
④
have reported
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An institution that properly carries the name university is a more comprehensive and complex institution than any other kind of higher education _____.
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settlement
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establishment
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construction
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structure