2009职称英语历年真题c级理工类：阅读判断
A Right B Wrong C Not mentioned
17 The radiocarbon dating technique is only about 40 years old
A Right B Wrong C Not mentioned
18 An atom of ordinary carbon has six protons and eight neutrons
A Right B Wrong C Not mentioned
19 Radar is used to determine the characteristics of radiocarbon.
A Right B Wrong C Not mentioned
20 Radiocarbon is reliable in dating an object back to at least 50，000 years.
A Right B Wrong C Not mentioned
21 When an organism dies， the C-14 in it begins to decay.
A Right B Wrong C Not mentioned
22 The half-life of C-14 is about 25，000 years.
A Right B Wrong C Not mentioned
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