【判断题】
3.由于NaOH易吸收空气中的CO2,所以在NaOH溶液中，常含有少量的碳酸钠。（ ）
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相关试题
【判断题】
4.用硝酸银标准溶液滴定氯离子时，指示剂铬酸钾的用量不必严格控制。（ ）
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5.选择酸碱指示剂的原则是同一类型的滴定，选用同样的指示剂。( )
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6.甲基橙指示剂在碱性溶液中显黄色。（ ）
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7.酸性铬蓝K指示剂在变色终点由红色变为蓝色。 ( )
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9.凡是正离子，其迁移速度都是一样的。（ ）
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10.在硫酸亚铁溶液中，加入少量铁粉和稀硫酸，可抑制硫酸亚铁氧化。（ ）
【判断题】
11.在石灰混凝处理中，先加混凝剂后再加石灰。( )
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12.一级除盐系统中，除碳器应设置在阴床之前。（ ）
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13.提高再生剂用量，可以提高树脂的工作交换容量，所以再生时，再生剂加得越多越好。（ ）
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14.强酸阳离子交换树脂漏入阴床，会引起阴床出水水质变差。( )
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15.盐酸的纯度对离子交换树脂的再生程度和出水水质影响不大。( )
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16.采用凝结水处理的机组，允许凝汽器有较大程度的泄漏。（ ）
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17.循环冷却水系统中的含盐量或离子含量是不变化的。（ ）
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18.为了防止发电机导线发生腐蚀，水内冷发电机冷却水的PH值一般应小于6.8。( )
【判断题】
19.锅炉给水加联氨是为了提高其pH值。（ ）
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20.一级除盐水处理设备产生的碱性废水一般少于酸性废水。( )
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21.电力系统稳定运行时，发电机发出的总功率与用户消耗的总功率相等。（ ）
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22火力发电厂的能量转换过程是:燃料的化学能热→能→机械能→电能。( )
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23.若流过几个电阻的电流相等，这几个电阻一定是并联。（ ）
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24.流量是指单位时间内流体流过某一截面的量。( )
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25.火力发电厂的主要污染物是烟气、废水、粉煤灰和噪声。( )
【判断题】
26.0.01mol/L氢氧化钠溶液的pH值等于2。( )
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27.电解质是通过电流后发生电离的。( )
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28.在任何情况下，水的离子积都是10-14。( )
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29.测定结果的精密度好，结果的准确度也一定好。( )
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30.指示电极都是离子选择性电极。( )
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31.膜电位就是玻璃电极内部溶液与外部溶液之间产生的电位差。( )
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32.溶液的温度升高，溶液的电导率减小。( )
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33.一般来说，树脂的颗粒越小，交换反应速度越快，但压力损失相应增大。( )
【判断题】
34.在逆流再生固定床中，中间配水装置以上的树脂也起离子交换的作用。( )
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35.强酸阳离子交换树脂的工作交换容量比弱酸阳离子交换树脂的高。( )
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36.弱酸阳离子交换树脂适合处理碱度与硬度比值在1.0~1.2之间的水。( )
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37.由于温度对化学反应一般都有影响，所以化学仪表一般都有温度补偿元件或对水样采取恒温措施。( )
【判断题】
38.酸度计长期使用时，要经常用标准缓冲溶液定位，才能保证仪器准确测量。( )
【判断题】
39.分光光度计中的光电池、光电管是接收光的元件，因此绝对不怕光。( )
【判断题】
40.pH表与pNa表所用甘汞电极构造基本相同，只是内装电解质液的浓度不同。( )
【判断题】
41.EDTA对每一种金属离子都有一个可定量滴定的pH值范围。( )
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42.电渗析除盐中的离子交换膜的作用与离子交换除盐中离子交换树脂的相同，都是起离子交换作用。( )
【判断题】
43.不同液体在相同压力下沸点不同，但同一液体在不同压力下沸点也不同。( )
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E. A virtual machine CPU reservation is configured.
