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23013.___G 代码分为模态和非模态代码，非模态代码是指某一 G 代码被指定后就一直有效。
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23014.___SIEMENS 系统中，子程序 L10 和子程序 L010 是相同的程序。
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23015.___程序编制中首件试切的作用是检验零件图设计的正确性。
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23016.___数控机床电控系统包括交流主电路、机床辅助功能控制电路和电子控制电路，一般将前者称为“弱电”，后者称为“强电”。
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23017.___开环进给伺服系统的数控机床，其定位精度主要取决于伺服驱动元件和机床传动机构精度、刚度和动态特性。
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23018.___直线型检测元件有感应同步器、光栅、磁栅、激光干涉仪。
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23019.___滚珠丝杠螺母副是回转运动与直线运动相互转换的传动装置，具有高效率、摩擦小、寿命长、能自锁等优点。
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23020.___步进伺服系统在数控系统内部硬件配置参数中标识设定为 45，交流伺服驱动器在数控内部硬件配置参数中标识设定为 46。
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23021.___CNC 装置的软件包括管理软件和控制软件两类，控制软件有输入输出程序、显示程序和诊断程序等组成。
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23022.___数控机床的反向间隙可用补偿来消除，因此对顺铣无明显影响
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23023.___数控机床的静刚度或柔度是抗振力的衡量指标。
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23024.___数控机床切削精度检验又称为动态精度检验。
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23025.___机床动态精度是指机床在切削热、切削力等作用下的精度。
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23026.___滚珠丝杠副的螺母或支撑轴承预紧力过紧或过松会导致反向误差大，加工精度不
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23027.___在半闭环控制系统中，伺服电动机内装编码器的反馈信号只是速度反馈信号。
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23028.___直线型检测装置有感应同步器、光栅、旋转变压器。
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23029.___数控机床不适用于复杂、高精、多种批量尤其是单件小批量的机械零件的加工。
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23030.___刀库和机械手的定位精度要求较高，转塔不正位、不回零的现象占很大的比例。
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23031.___数控机床的精度检验内容包括几何精度、定位精度和切削精度。
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23032.___闭环数控机床的检测元件安装在工作台上。
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23033.___主轴上刀具松不开的原因之一可能是系统压力不足。
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23034.___有安全门的加工中心，在安全门打开的情况下也能进行加工。
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23035.___数控机床试运转噪声，不得超过 80 分贝。
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23036.___具有闭环检测装置的高精度数控机床，因直接检测反馈补偿的是运动部位的移动， 所以对机床传动链的要求不是很高。
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23037.___滚珠丝杠副消除轴向间隙的目的主要是减小摩擦力矩。
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23038.___检验数控车床主轴与尾座两顶尖等高情况时，通常只允许尾座端低。
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23039.___为了提高机床的定位精度、加工精度，常加装测量与反馈装置。
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23040.___一般高精度的数控机床多采用，所有的控制信号都是从数控系统发出的。
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23041.___精度要求较高的可转位面铣刀应设置调整块，以减小铣刀的轴向跳动量。
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23042.___一般脉冲当量越小，机床的加工精度越高。
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23043.___测量范围分别为 0～25mm、25～50mm 的两外径千分尺的示值范围相同。
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23044.___切削加工中的振动会影响已加工表面的质量。其中，低频振动会产生波度，高频振动会产生粗糙度。
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23045.___工件的加工精度和表面粗糙度同时受到工艺系统各组成部分精度的影响。
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23046.___杠杆千分表的测杆轴线与被测工件的夹角越小，测量误差就越大。
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23047.___相对测量法是把放大了影像和按预定放大比例绘制的标准图形相比较，一次可实现对零件多个尺寸的测量。
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23048.___表面粗糙度要求是保证零件表面微观精度的重要要求，也是合理选择数控机床、刀具及确定切削用量的重要依据。
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23049.___在确定工件在夹具的定位方案时，出现欠定位是错误的。
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23050.___用千分表测量端面跳动误差时，千分表表杆应与工件轴线垂直。
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23051.___在开环和半闭环数控机床上，定位精度主要取决于进给丝杠的精度。
【填空题】
23052.___机床夹具按使用机床类型分类，可分为通用夹具、专用夹具和组合夹具。
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23053.___水平仪可用于测量机件相互位置的平行度误差。
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We must ___ on the amount of time we use on this project.
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We have to be very patient with this experiment. It will take time for some effects to ___ clearly.
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Be careful when you get along with her because she is known for her short ___.
A. temper
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C. mood
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It seems that wearing less formal clothing to school and work is becoming a(n) ___.
A. trend
B. campaign
C. goal
D. occurrence
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You cannot correct children’s bad behavior simply with a (n) ___ or two on the hand or face.
A. slap
B. smash
C. slam
D. strike
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Our investigations (调查) ___ something very surprising – many of the employees are underpaid and work overtime all the time.
A. reveal
B. bump
C. rip
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She was James’s faithful assistant, in whom he could have ___ confidence.
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If you visit this website, you can ___ the categories to find information about all the universities in that area.
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Making New Year’s resolutions (计划) is a custom that still ___ in this country.
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The military officers were more ___ about their own victory and therefore more willing to predict their enemy’s defeat.
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___ is no doubt that overwork and much worry caused his illness.
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___ a day goes by that I don’t receive dozens of junk mails in my email box.
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Please trust me. Try this new method ___.
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John said Mom was coming back tomorrow, not next week. If this is the ___, we’ll all have to clean the house thoroughly.
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It is far too late for you to go out and play football, ___ the fact that it’s raining.
A. no doubt
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C. given
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A. accurately
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In many Middle Eastern cultures a deadline is taken as a(n) ___, and such terms should not appear in a purchase contract with businessmen from these countries.
A. target
B. favor
C. honor
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