会计考友 发表于 2012-8-16 00:07:50

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
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