Leo Rosenbergs Die Normentheorie should play a guiding role of how to solve the problem of acceptig the unfavorable result when a case is not be proofed in Chinese judicial practice.
The essence of distribution of burden of proof is who should accept an unfavorable result when a case does not be proofed.
证明责任分配问题的实质是在案件事实真伪不明的场合，谁最终应当承担不利后果。
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For improving need assembling the casing head, the cutting casing pipe on project, we have designed the device of cutting casing head to change unfavorable factors using acetylene gas to cut case.