问题
单项选择题
铁盐
A．在盐酸酸性条件下检查
B．在硝酸酸性条件下检查
C．在醋酸盐缓冲液(pH3.5)中检查
D．在硫酸酸性条件下检查
E．在磷酸盐缓冲液(pH6.8)中检查
以下杂质检查的条件是
答案
参考答案：A
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铁盐
A．在盐酸酸性条件下检查
B．在硝酸酸性条件下检查
C．在醋酸盐缓冲液(pH3.5)中检查
D．在硫酸酸性条件下检查
E．在磷酸盐缓冲液(pH6.8)中检查
以下杂质检查的条件是
参考答案：A
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| Jim went to school to study history, but when he 1 his first year, he didn't pass the exam and his teacher said 2 him, "You have to 3 school." When the boy's father heard this news, he was very worried. He came to the school to see the 4 . He asked the teacher to let Jim go 5 with his study the next year. "He is a good boy. He always 6 well in history!" said Jim's father. "And if you let him pass the exam this time, he'll do 7 next year and pass the exam!" "No, no, that's impossible (不可能的)!" answered the teacher. " 8 I asked him when Napoleon died but he didn't know!" "Please sir, give him 9 chance (机会)," said Jim's father. "We don't have any newspapers in our house, so 10 in our family knew that Mr. Napoleon was ill!" | ||||
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