新东方网络课堂:2011年职称英语考试理工类C级模拟（5） 16 Nowadays many scientists depend on radiocarbon for dating age-old objects 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 |
