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【简答题】
用原子吸收光谱法测定试液中镉的含量,准确移取20.00mL含镉试液两份于50mL容量瓶中,在其中一份试液中加入2.00mL浓度为10μg/mL的镉标准溶液,稀释至刻度后测得未加镉标准溶液的吸光度为0.042.加有镉标准溶液的吸光度为0.116,计算试液中镉的浓度。
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举一反三
【判断题】预防艾滋病可以注射疫苗。()
A.
正确
B.
错误
查看完整题目与答案
【单选题】The postal rule is an exception to the principle that acceptance must be communicated. Which of the following is/are requirements for the postal rule to apply?(1)The letter must be received by the off...
A.
(1) and (2)    only
B.
(2) and (3)    only
C.
(2) only
D.
(1), (2) and (3)
查看完整题目与答案
【单选题】产品生命周期理论是美国哈佛大学教授( )1966年在《产品周期中的国际投资与国际贸易》首次提出。
A.
菲利普·科特勒
B.
迈克尔·波特
C.
雷蒙德·弗农
D.
彼得·德鲁克
查看完整题目与答案
【单选题】If Jenny is charged with petit theft of Fisher’s food, a misdemeanor, the court should rule
A.
Jenny is not guilty because she was acting under the direction of Joey.
B.
Jenny is guilty because an otherwise criminal act cannot be justified by threats of starvation.
C.
Jenny is not guilty because there was no “carrying away" of Fisher's food, and hence no completed theft crime was committed.
D.
Jenny is not guilty if a reasonable person would have regarded the theft as essential to avoid starvation.
查看完整题目与答案
【多选题】下列哪些是常用的分离、提纯蛋白质的方法
A.
透析
B.
电泳
C.
盐析
D.
离心
查看完整题目与答案
【单选题】湿式自动喷水灭火系统的温度适用范围为 °C。
A.
4 ～70
B.
0 ～68
C.
大于70
D.
小于4
查看完整题目与答案
【多选题】下列哪些是常用的分离、提纯蛋白质的方法
A.
透析
B.
电泳
C.
盐析
D.
离心
E.
生物碱试剂
查看完整题目与答案
【判断题】可以注射疫苗来预防艾滋病。( )
A.
正确
B.
错误
查看完整题目与答案
【简答题】What is the rule for palyers to play table tennis?
查看完整题目与答案
【单选题】Consider a variation on the Koch curve. Start with a line segment of length L. The iteration rule is illustrated below, where each segment is replaced by five segments, each of length 1/3 the origin...
A.
  (25 / 9) L
B.
  (10 / 6) L
C.
  (9 / 5) L
D.
  (16 / 9) L
E.
  (10 / 9) L
查看完整题目与答案
相关题目：
【判断题】预防艾滋病可以注射疫苗。()
A.
正确
B.
错误
查看完整题目与答案
【单选题】The postal rule is an exception to the principle that acceptance must be communicated. Which of the following is/are requirements for the postal rule to apply?(1)The letter must be received by the off...
A.
(1) and (2)    only
B.
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D.
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【单选题】产品生命周期理论是美国哈佛大学教授( )1966年在《产品周期中的国际投资与国际贸易》首次提出。
A.
菲利普·科特勒
B.
迈克尔·波特
C.
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D.
彼得·德鲁克
查看完整题目与答案
【单选题】If Jenny is charged with petit theft of Fisher’s food, a misdemeanor, the court should rule
A.
Jenny is not guilty because she was acting under the direction of Joey.
B.
Jenny is guilty because an otherwise criminal act cannot be justified by threats of starvation.
C.
Jenny is not guilty because there was no “carrying away" of Fisher's food, and hence no completed theft crime was committed.
D.
Jenny is not guilty if a reasonable person would have regarded the theft as essential to avoid starvation.
查看完整题目与答案
【多选题】下列哪些是常用的分离、提纯蛋白质的方法
A.
透析
B.
电泳
C.
盐析
D.
离心
查看完整题目与答案
【单选题】湿式自动喷水灭火系统的温度适用范围为 °C。
A.
4 ～70
B.
0 ～68
C.
大于70
D.
小于4
查看完整题目与答案
【多选题】下列哪些是常用的分离、提纯蛋白质的方法
A.
透析
B.
电泳
C.
盐析
D.
离心
E.
生物碱试剂
查看完整题目与答案
【判断题】可以注射疫苗来预防艾滋病。( )
A.
正确
B.
错误
查看完整题目与答案
【简答题】What is the rule for palyers to play table tennis?
查看完整题目与答案
【单选题】Consider a variation on the Koch curve. Start with a line segment of length L. The iteration rule is illustrated below, where each segment is replaced by five segments, each of length 1/3 the origin...
A.
  (25 / 9) L
B.
  (10 / 6) L
C.
  (9 / 5) L
D.
  (16 / 9) L
E.
  (10 / 9) L
查看完整题目与答案