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产品规格等于0.5±9刀，则选取Set Head的最大变化范围是（）。
A.0.3个刀
B.0.5个刀
C.0.6个刀
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Passage Two I have certainly seen lots of changes in my lifetime! I look around my home and see "mod cons" that I could never have dreamed of 50 or 60 years ago. I spent the early part of childhood in a cottage without running water or electricity and yet these days, I feel paralyzed if there is a power cut for even just an hour or two! So, I have changed too. Things that I couldn’t even imagine in the past now seem quite normal. Businessmen can travel from London to New York in three hours and lots of people exceed the seventy-mile-per-hour speed limit on motorways. A person of 75 is not old these days. A serious illness does not mean certain death because there have been so many advances in medical science. We no longer need to be afraid of contracting diseases like polio or smallpox. I can speak to my son in Australia from my own sitting room here in Manchester, watch athletes running a race on the other side of the world without moving from my own home and I can even do my shopping while I sit here in an armchair. I never need to worry about food going bad in the warm weather and, at the flick of a switch, I can have a hot meal in a couple of minutes. So, it seems, the quality of life has greatly improved since my own childhood. I’m not convinced, however, that people are happier today than they were 50 years ago. We are certainly materially better off than we were but most people still seem to be weighed down by problems. My daughter and her family are a good illustration. They have a spacious, comfortable home with every labor-saving device you can think of. There’s a washing machine, a clothes dryer, a food processor, a vacuum cleaner and all sorts of other household items which are designed to save time but it seems to me that my daughter and her husband just spend all that "saved" time working! They never relax and are always complaining of being tired and "stressed".
A．How life has improved.B．How life has become worse.C．A comparison of life now and that in the past.D．Memory of life in the past.
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当理想空载转速n0相同时，闭环系统的静差率Sb与开环下的Sk之比为（）。
A.1
B.0（K为开环放大倍数）
C.1+K
D.1/（1+K）
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智能手机就像一台电脑，不仅能上网，还能通过安装程序实现多种功能，为用户带来了全新的体验，但是其安全问题也不容忽视，下列做法错误的是（）。
A . 安装正版软件，并及时更新
B . 随意下载安装手机软件
C . 设置开机密码，防止别人随意使用自己的手机
D . 不随便打开陌生人发来的链接
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构成其它颜色的三原色是（ ）
A．紫、红、青
B．红、黄、绿
C．黄、红、蓝
D．橙、蓝、紫
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建筑物结构承重可分为（）。
A . 墙承重式、框架结构
B . 墙承重式
C . 半框架结构，框架结构
D . 墙承重式、框架结构、空间结构、半框架结构
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提出“治外必本于内”思想的专著是
A．《外科正宗》
B．《外科理例》
C．《外科启玄》
D．《外台秘要》
E．《诸病源候论》
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电话预订客房具有直接、迅速、清楚地传递双方信息的特点，前厅服务员受理客人电话预订时无特殊要求。（）
A.对 B.错
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同体积的污泥含水率不同，降低百分比后，污泥体积仍相同。（）
同体积的污泥含水率不同，降低百分比后，污泥体积仍相同。（）
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约75%的肛门直肠感染性病变与肛窦感染有关。
A . 正确
B . 错误
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当温度高达kT～mc2(mc2～0.5MeV为电子的静止质量所对应的能量)，可以发生正、负电子对的产生与湮没过程： 这时正、负电子的数目不再是固定不变的，而需由化学平衡条件确定．由于光子气体的化学势为0，于是有 μ-+μ+=0． 现考虑的高温，这时正、负电子将大量产生，以致初始时的e-密度n0可以忽略不计，即 n-=n++n0≈n+ 因而μ-=μ+(e-与e+具有相同的质量、自旋，它们的化学势只由粒子数密度决定，今n-=n+，故μ-=μ+)．再利用上述化学平衡条件，即得μ-=μ+=0．试在上述条件下： (i)计算正、负电子数密度n-=n+=? (ii)计算正、负电子的能量密度(即单位体积内的平均能量)u-=u+=? (iii)计算正、负电子的能量密度与相同温度下光子能量密度之比．
A.5MeV为电子的静止质量所对应的能量)，可以发生正、负电子对的产生与湮没过程：B.174.24.96:6088/Latex/latex.action?latex=ZV57LX0rZV57K31cbGVmdHJpZ2h0YXJyb3cgXGdhbW1hIFxsZWZ0KCBcZ2FtbWEg5Luj6KGo5LiA%0D%0A5Liq5oiW5Yeg5Liq5YWJ5a2QIFxyaWdodCku'C.由于光子气体的化学势为0，于是有D.E.174.24.96:6088/Latex/latex.action?latex=a1RcZ2cgbWNeezJ9'F.再利用上述化学平衡条件，即得μ-=μ+=0．试在上述条件下：
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供求规律的作用体现在
A．决定商品价格变化
B．支配商品流量和构成
C．影响商品流通的方向
D．促进市场繁荣
E．协调生产和消费
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下列关于交易所上市基金(ETF)的表述，错误的是______。
A．ETF可以在交易所挂牌买卖，投资者可以直接买卖ETF份额
B．ETF基本是指数型开放式基金
C．投资者可以用现金申购或者赎回ETF
D．ETF可以分散投资，降低投资风险
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再贷款业务既是中央银行“最后贷款人”职能的集中表现，也是中央银行投放基础货币的重要渠道。()
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参考答案
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（由十点题库聘请的专业题库老师提供的解答）
