仪器接地为避免触电,接地电阻应小于等于()
A.4欧
B.5欧
C.7欧
D.8欧
E.10欧
参考答案:A
解析:国家标准规定:接地电阻小于等于4欧。
(a) IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors contains guidance on the use of accounting policies and accounting estimates.Required:Explain the basis on which the management of an entity must select its accounting policies and distinguish, with an example, between changes in accounting policies and changes in accounting estimates. (5 marks)
适用于独立单粒钻石镶嵌,在钻石外围有一圈较厚的边框向内侧倾斜的镶嵌称为()。
A.光圈镶
B.群镶法
C.槽镶法
D.园镶法