emitting from radioactive elements which can cause fogging
photographic plate is called radioactivity
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It is true that the first activity in test preparation is to
determine what the test will be all about.
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A controlled experiment is used to test a hypothesis.
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it is the activity that not do to work already that is the test
efficiency a plan
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There is no specific collective noun form photographic film, in
which case a noun suitable for the context is used, for example a
roll of photographic film, a case of photographic film, an archive
of photographic film, etc.