Taking a news photograph has two obvious characters : actuality and instancy . The former embodies objectivity and reality . But the latter is a basic character of taking a news photograph and is the chief content of this investigation too .
Given the severe methane disaster situation in china 's coal mines , the reasons of the disasters are anaylzed with safety science & technology and management science , and the instancy and necessity of strengthening basie research on safety science is also put fonvard .
