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地质文献中常要用2个（组）参数和连接符号来表示参数的变化范围。如：1）某地层的走向为300～340”；2）某铜矿品位在0．5％～4．5％之间变化；3）某地质体的同位亲年龄为95～105Ma4）成矿温度：240～300℃；5）矿石中某同位素变化范围为3．187‰—－7．25％等等。这里的2个（
Geological literature often use 2 (group) parameters and connection symbols to indicate the range of parameters. Such as: 1) the direction of a stratum is 300 ~ 340 "; 2) the grade of a copper ore varies from 0.5% to 4.5%; 3) the isotopic age of a geological body is 95 ~ 105Ma4) Temperature: 240 ~ 300 ℃; 5) Some isotopes in ore range from 3.187 ‰ to 7.25%, etc. The 2