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Before starting
the test, choose test method, and estimate an initial mass and Δm. Start th e test. If the first
specimen fails, decrease the mass of the falling dart by Δm. If the first specimen is not a failure, increase the mass
of the falling dart by Δm. Continue the test according to this rule. In brief, increase or decrease by Δm according
to whether the former specimen is a failure or not. After 20 specimens, calculate the total number of failed
specimens N. If N equals to 10, the test is over. If N is less than 10, add specimens and continue to test until N