metal casing短语¹¹⁴⁴⁶⁷⁺⁴ 基本例句 金属壳,金属包皮 In order to get more accurate logging data, it is very important to do research on the influence rule of metal casing and cement sheath to cross- well electromagnetic logging. 为了得到更精确更趋于实际的测井数据，研究套管和水泥环等对井问电磁测井的影响规律具有非常重要的意义。 cnki