相关试题
【单选题】
关于数值修约,下面说法正确的是___
A. 拟修约数字应在确定修约位数后多次连续修约获得结果。
B. 拟舍弃数字的最左一位数字小于5时,则舍去,保留的各位数字不变。
C. 拟舍弃数字的最左一位数字大于5,且其后跟有并非全部为0的数字时,才可以进一,即保留的末位数字加1
D. 拟舍弃数字的最左一位数字为5,而右边无数字或皆为0时,若所保留的末位数字为偶数则进一,为奇数则舍弃
【单选题】
对于抗渗、抗冻等有特殊要求的混凝土砂的含泥量、泥块含量及坚固性指标要求分别为___。
A. 3.0% 1.0% 8%
B. 1.0 % 3.0% 8%
C. 1.0 % 3.0% 5%
D. 3.0% 1.0% 5%
【单选题】
GB50164-2011《混凝土质量控制标准》中要求泵 送混凝土的坍落度设计值 不宜超过 mm,扩展度不宜小于 mm,坍落度经时损失不宜大于30mm ;自密实混凝土的扩展度不宜小于 mm 。___
A. 160、500、600
B. 180、500、600
C. 160、600、500
D. 180、600、500
【单选题】
氯离子迁移系数(RCM法)试验中混凝土龄期宜为 d;电通量试验混凝土龄期应为 d,单混凝土中水泥混合材与矿物掺合料之和超过胶凝材料用量的50%时,测试龄期应为 d。___应为28/28/56
A. 28、56、84
B. 84、56、28
C. 56、28、84
D. 84、28、56
【单选题】
减水剂检验中,当混凝土坍落度为(210±10)mm时,应分 层装入;GB/T50080-2002中混凝土坍落度试验中分 层装入。___
A. 1、2
B. 2、3
C. 3、3
D. 2、2
【单选题】
实验室的检测报告不必包括___
A. 唯一性标识
B. 实验室的名称和地点
C. 检测仪器的标识
D. 不确定度的说明
【单选题】
我国的法定计量单位是以___单位为基本,根据我国的情况,适当增加了一些其他单位构成的。
A. 米制
B. 公制
C. 国际单位制
D. 英制
【单选题】
硅酸盐熟料矿物中水化热最高的是___。
A. 硅酸三钙
B. 铝酸三钙
C. 铁铝酸四钙
D. 硅酸二钙
【单选题】
已知配制C35混凝土所用普通水泥P.O52.5的实际强度是55MPa,采用碎石,其回归系数αa=0.46,αb=0.07,该施工单位的强度标准差是3.0MPa,则W/C应是:___。
A. 0.33
B. 0.50
C. 0.61
D. 0.69
【单选题】
粘土塑限高,说明粘土有___种性能。
A. 粘土粒子的水化膜薄,可塑性好
B. 粘土粒子的水化膜薄,可塑性差
C. 粘土粒子的水化膜厚,可塑性好
D. 粘土粒子的水化膜厚,可塑性差
【单选题】
配制C40级混凝土所用粗集料的母岩抗压强度至少应为___MPa。
【单选题】
由细度模数为3.25的天然砂改为细度模数为1.95的天然砂,为保持水泥混凝土强度不变和坍落度不变,则最合适的办法是哪一项___。
A. 增加砂率
B. 减小砂率
C. 增加拌和用水量
D. 减小水泥用量
【单选题】
界限含水量测试时 ___。
A. 考虑土的结构
B. 未考虑土的结构
C. 无法确定土的结构
D. 考虑不考虑土的结构都行
【单选题】
在测定含水量过程中,当用各种测试方法所得结果有异时,则结果以标准方法为准,该法为___。
A. 烘干法
B. 比重法
C. 酒精燃烧法
D. 碳化钙气压法
【单选题】
钢筋混凝土结构的混凝土氯离子含量不应超过胶凝材料总量的0.10%, 预应力混凝土结构的混凝土氯离子总含量,不应超过胶凝材料总量的___ %。
A. 0.06
B. 0.10
C. 0.05
D. 0.03
【单选题】
混凝土氯离子扩散系数试验应采用直径为___的圆柱体试件。
A. φ100 mm×100 mm
B. φ50 mm×100 mm
C. φ100 mm×50 mm
D. φ50 mm×50 mm
【单选题】
在钢筋拉伸试验中,若断口恰好位于刻痕处,且极限强度不合格,则试验结果___。
【单选题】
适用于各种土测试含水率的方法___
A. 烘干法
B. 酒精燃烧法
C. 微波加热法
D. 核子射线法
【单选题】
对同一批试件强度的标准差,下列说法不正确的是___。
A. 标准差越大,强度分布的离散性越大
B. 标准差越大,强度平均值越大
C. 标准差越大,施工控制水平越差
D. 标准差的大小不能直接反应强度的高低
【单选题】
砂浆分层度测定时,指针对准零点后,拧开制动螺丝,同时计时, s时立即拧紧螺丝。___
【单选题】
土粒比重(密度)试验中,比重瓶法适用于粒径 的各类土。___
A. ≤5mm
B. <5mm
C. 2.5mm~5mm
D. 5mm~10mm
【单选题】
碎石压碎指标值试验的加荷速度为___kN/s。
【单选题】
界限含水率试验适用于粒径小于0.5mm以及有机质含量 %的土。___
A. ≤5
B. <5
C. ≤10
D. <10
【单选题】
计算机病毒是计算机系统中一类隐藏在___上蓄意破坏的捣乱程序。
A. 内存
B. 软盘
C. 存储介质
D. 网络
【单选题】
在以下网络威胁中,不属于信息泄露的是___
A. 数据窃听
B. 流量分析
C. 拒绝服务攻击
D. 偷窃用户账号
【单选题】
在网络安全中,在未经许可的情况下,对信息进行删除或修改,这是对___的攻击
A. 可用性
B. 保密性
C. 完整性
D. 真实性
【单选题】
下列不属于网络技术发展趋势的是___
A. 速度越来越高
B. 从资源共享网到面向中断的网络发展
C. 各种通信控制规程逐渐符合国际标准
D. 从单一的数据通信网向综合业务数字通信网发展
【单选题】
对网络系统中的信息进行更改、插人、删除属于___.
A. 系统缺陷
B. 主动攻击
C. 漏洞威胁
D. 被动攻击
【单选题】
___是指在保证数据完整性的同时,还要使其能被正常利用和操作。
A. 可靠性
B. 可用性
C. 完整性
D. 保密性
【单选题】
___是指保证系统中的数据不被无关人员识别。
A. 可靠性
B. 可用性
C. 完整性
D. 保密性
【单选题】
在关闭数据库的状态下进行数据库完全备份叫作___
A. 热备份
B. 冷备份
C. 逻辑备份
D. 差分备份
【单选题】
下面___攻击是被动攻击,
A. 假冒
B. 搭线窃听
C. 篡改信息
D. 重放信息
【单选题】
AES是___
A. 不对称加密算法
B. 消息摘要算法
C. 对称加密算法
D. 流密码算法
【单选题】
在加密时将明文的每个或每组字符由另一个或另一组字符所代替,这种密码叫作___
A. 移位密码
B. 替代密码
C. 分组密码
D. 序列密码
【单选题】
DES算法一次可用56位密钥把___位明文加密。
【单选题】
___是典型的公钥密码算法。
A. DES
B. IDEA
C. MDS
D. RSA
【单选题】
___是消息认证算法。
A. DES
B. IDEA
C. MD5
D. RSA
【单选题】
对网络系统中的信息进行更改、插入、删除属于___。
A. 系统漏洞
B. 主动攻击
C. 漏洞威胁
D. 被动攻击
【单选题】
___是指在保证数据完整性的同时,还要使其能正常利用和操作。
A. 可靠性
B. 可用性
C. 完整性
D. 保密性
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