填空题 Questions 31-37
Complete the notes below.
Write NO MORE THAN TWO WORDS AND/OR A NUMBER for each answer.

The year that print identification was first used is in (31)
Finger print identification has four functions:
· to create image
· to (32)
· to keep information
· to (33)
Finger prints are a transfer of (34) from our fingers to an object.
Mass-spectrometry can help experts get (35) .
Different chemicals in finger print can be classified by (36) .
The smallest mass-spectrometers weiqht (37)