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【单选题】
测定钢中奥氏体含量时的X射线定量物相分析方法是 （ ）A.
外标法
B.
内标法
C.
直接比对法
D.
K 值法
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【判断题】I'm Lisa. This is my first day at my internship in the hotel. I will always greet people with a smile.
A.
正确
B.
错误
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