螺距0.56恒定时:
0.56ρ =62.5360螺距渐变时: 方程1:
09900
ρ=77.90.5699003609900360990010.032360990010620
方程2:
ρ=79.110.62(99003602)(990036099002)10.08236010620
11700
方程3:
ρ=81.450.86(99003605)(990036099005)40.152360111700
13140
方程4:
ρ=86.391.46(99003609)(990036099009)80.1823601314014940
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