Traditional network analyzer has large volume , cannot save the data which is tested and cannot connet with pc . these give user a lot of discommodity
2.
However , the general - purpose image measurement system yield a lot of discommodity and insufficiency in particular applications . so the development of this task has its essential and practical significance
3.
Operating system experiment system ( oses ) has been a old topic , but it developed slowly . so it is discommodity to go deep into study the principle of the operating system ( os ) for the learners , that most learners ca n ' t master the os
4.
Image measurement and analysis on - line and at high accuracy has been applied in many industrial filed widely . however , the general - purpose and some special - purpose image - processing system yield a lot of discommodity and insufficiency in particular applications . so the development of this task has its essential and practical significance
5.
The traditional analog frequency - sweeping instrument , which mostly uses the lc circuit as the frequency oscillator , is more expensive , too much bigger and heavy to carry . it can only display the curve of amplitude - frequency , but ca n ' t used to measure the phase - frequency , and ca n ' t used to print the curve of frequency response characteristic either . it brings many discommodity to the user
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