【单选题】
活性炭是由含___为主的物质作为原料,经高温炭化和活化制成的疏水性吸附剂。
A. 铁;
B. 铝;
C. 碳;
D. 硅。
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答案
C
解析
暂无解析
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.测定微量硅时,加药顺序是___。
A. 酸性钼酸铵一酒石酸一1,2,4酸;
B. 1,2,4酸一酒石酸一酸性钼酸铵;
C. 酸性钼酸铵一1,2,4酸一酒石酸;
D. 酒石酸一酸性铝酸铵一1,2,4酸。
【单选题】
浮动床水垫层过高可导致床层在成床或落床时发生___现象。
A. 压实;
B. 乱层;
C. 过快;
D. 过慢。
【单选题】
.用硫酸作再生剂时,采用先低浓度后高浓度的目的是为了___。
A. 提高再生效率;
B. 防止硫酸钙沉淀;
C. 降低酸耗;
D. 缩短再生时间。
【单选题】
逆流再生固定床再生时加水顶压的目的是 ___。
A. 防止乱层;
B. 稀释再生液;
C. 防止中排承压力高;
D. 节省除盐水。
【单选题】
天然水经混凝处理后,水中的硬度___。
A. 有所降低;
B. 有所增加;
C. 基本不变;
D. 为零
【单选题】
遇到不同类型的树脂混在一起,可利用它们___的不同进行简单分离。
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B. 粒度;
C. 密度;
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【单选题】
测定水的硬度,常选用___作指示剂。
A. 铬黑T;
B. 甲基橙;
C. 酚酞;
D. 氯化亚锡。
【单选题】
石英砂滤池反洗操作时,滤层膨胀高度约为层高度的___。
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B. 5%~10%;
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【单选题】
浮动床正常运行流速一般控制在___m/h。
A. 5~20;
B. 30~50;
C. 50~100;
D. 20。
【单选题】
逆流再生离子交换器压实层树脂的作用是___。
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B. 备用树脂;
C. 防止再生时乱层;
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【单选题】
如果发现电极敏感泡外壁有微锈,应将其放在___溶液中浸泡予以快速除锈处理。
A. HCl;
B. 稀H2SO4;
C. 浓NaOH;
D. NaCl。
【单选题】
使用酸度计测定溶液的pH值,指针达到平衡时间较长,原因是___。
A. 电极断路;
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D. 电极老化。
【单选题】
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A. 0.2;
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C. 0.4;
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【单选题】
逆流再生除盐设备大反洗后,再生时再生剂用量要比通常再生多___倍。
A. 1;
B. 2;
C. 0;
D. 3。
【单选题】
用玻璃电极测定溶液的pH值,原理是玻璃电极的电位与___呈线性关系。
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【单选题】
酸度计用玻璃电极作测定H+活度的___,甘汞电极作参比电极。
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【单选题】
001×7型树脂是___。
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【单选题】
校正pNa表时,采用pNa4定位液定位,其[Na+]为___mg/L。
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【单选题】
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【单选题】
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【单选题】
测定聚合铝的pH值是___。
A. 取原液直接测定;
B. 取原液的1%水溶液
C. 取原液10ml加90ml水混匀后测定;
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【单选题】
覆盖过滤器在“爆膜”过程中,进气的压力应维持在___ MPa。
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【单选题】
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【单选题】
弱酸阳离子交换树脂由氢型转化为钠型时,其体积约增大___%以上。
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【单选题】
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【单选题】
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【单选题】
凝结水的pH值偏低时,会使___的铁腐蚀,引起凝结水的含铁量升高。
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【单选题】
哪一项不是高速混床采用体外再生的原因:___
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已知某标准NaOH溶液在保存中吸收了CO2,用此溶液来标定盐酸溶液,若以甲基橙做指示剂,则使盐酸溶液的浓度标定结果___。
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已知某标准NaOH溶液在保存中吸收了CO2,用此溶液来标定盐酸溶液,若以酚酞做指示剂,则使盐酸溶液的浓度标定结果___。
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【单选题】
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【单选题】
再生强酸性阳离子交换剂时,所用再生剂最好是___。
A. 1.5%H2SO4;
B. HNO3;
C. HCl;
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【单选题】
配制500mL0.1mol/L的盐酸溶液,需量取4.2mL浓盐酸,下列哪种量取仪器的操作是正确的___。
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