问题
单项选择题
不去蛋白的碱性苦味酸两点动力学法测定血肌酐时，应准确地读取反应后吸光度两个时间点是
A．10S和20S
B．20S和100S
C．20S和80S
D．60S和100S
E．60S和120S
答案
参考答案：C
解析：速率法测肌酐时，利用肌酐与苦味酸在20S和80S之间显色，假肌酐中乙酰乙酸在20秒内显色，其他大部分在80秒后显色。
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不去蛋白的碱性苦味酸两点动力学法测定血肌酐时，应准确地读取反应后吸光度两个时间点是
A．10S和20S
B．20S和100S
C．20S和80S
D．60S和100S
E．60S和120S
参考答案：C
解析：速率法测肌酐时，利用肌酐与苦味酸在20S和80S之间显色，假肌酐中乙酰乙酸在20秒内显色，其他大部分在80秒后显色。
A 25-five-year student from Hubei was admitted into Tsinghua University, China’ most famous university, after an eight-year ___21___．Li Jun comes from a small village of Hubei Province．He first ____22____ going to college in year 2000 ___23__he was admitted by a local school after __24___ from a secondary technical school at 17．As a ___25___ art student, he passed the exam again the next year but __26_____ school due to economic pressure in September 2002．Life seemed ___27___ but Li didn’t give in．He earned a _28_____ by working part-time in Wuhan’s art rooms and tutoring students．But he never lost sight of his lifelong dream of __29___ the Academy of Arts & Design of Tsinghua University．Li __30____ the college entrance examination for five continuous years from 2003．____31___, he missed making the cut one mark last year． In 2008, his fifth try, Li’s efforts ___32_____．He finished the qualifying exam in his province and was finally admitted as a sculpture major in Tsinghua University．Every year, Li took art __33___ in Beijing and took exams from December to March．He then took cultural courses in his school till June．The rest of the year he spent on __34____ work．Li said he hadn’t ____35___any money from his family since he graduated from the technical secondary school．Li said the reason he maintained for eight years was that he wanted to change his __36_____ through knowledge． _____37___ by his contribution, Li Jun’s university __38____ him 9,000 yuan out of his tution fees of 11,450 yuan．An eight-year struggle may have come to an end for Li Jun, but a new ___39__ has now begun．Li said he would not worry about repaying loans at present．He wants to study well and __40___ more scholarships．
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