C -14断代法利用了:在任何情况下,C-12和C -14含量的比值不变。 A. 正确; B. 错误
A.
正确
B.
错误
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参考答案:
举一反三
【简答题】A college education is more and more seen as a means for economic betterment rather than a means for human betterment. This is a trend that is likely to persist and even accelerate.
【单选题】Why does the author say that a college education is more and more seen as a means for economic betterment rather than a means for human betterment?
A.
Because it is a trend that is likely to persist and even accelerate.
B.
Because the students increasingly are toward the majors which they bet would lead to employment.