化验工 初级（Laboratory technician junior）.docVIP

化验工 初级（Laboratory technician junior） Primary laboratory worker (should know) test question bank I. judgment questions (V) 1. error refers to the measured value and the true value is the degree of error is smaller, said measured value accuracy is higher (x) 2. white light is made up of seven kinds of light. The length of red light wave is the shortest in all kinds of monochromatic light, and the longest length of purple light wave. (x) 3. significant figures are figures actually measured when measured. 0.88745 according to the rules of revision to four is 0.8875 (x) 4.. Due to the stable nature of KmnO4, it can be used as the standard substance and directly prepared into standard solution. (V 5.) due to the electronic transition from the ground state to the first excited state is most likely to happen, for most elements, the resonance absorption line is the most sensitive line. Therefore, the resonance line of an element is also called an analytic line. (x) 6. hydrogen flame detector is a universal detector that can be used for organic analysis as well as for detecting inorganic compounds. (V) 7. preparation of NaOH standard solution, distilled water used should be distilled water to CO2. (V) is mainly divided into flame atomizer and non flame atomizer two categories 8. atomic absorption spectrometer atomic device. (* 9.) in flame atomic absorption spectrometer and maintenance, in order to keep the optical element clean, often should open the box cover and wipe the grating monochromator, collimating lens with lens cleaning paper. (x) 10. Longbow Bills law applies to all concentrations of colored solutions. Two. Fill in the blanks In 1. the buret recorded reading, after the decimal point should be retained by A. Two Determination of 2. absorbance spectrophotometry, measuring the concentration of colored solution relative standard deviation is the smallest cross from the 0.434; 3. sampling and preparation of samples must ensure that the sample is fully by the represent