土壤碱度
参考答案：
由碳酸盐和重碳酸盐导致土壤碱性的程度称土壤碱度。
井下接地网上任一保护接地点，测得的接地电阻，任何时候都不得大于（）
In terms of the Employment and Industrial Relations Act, 2002 describe the information which must be given to an employee by an employer in the absence of a contract of employment. (10 marks)
