It has not been resolved to set on closing in on the circular arc with the method of minimum Squares until now.
这是在此以前使用最小二乘法进行圆弧拟合所不能的。
Transient heat flux is difficult to be measured in thermal measuring field, and it has not been resolved very well until now.
瞬态热流的测量是热工测试的难点,也是一直没有得到很好解决的问题。
The sources of the Lower Paleozoic natural gases in central gas field in Erdos are an important problem that has not been resolved by now.
鄂尔多斯中部气田下古生界天然气藏的气源是目前尚未解决的重要问题。
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