电子政务的逻辑结构自下而上分为3个层次：基础设施层、统一的安全电子政务平台层、 【17】 层。
参考答案：知识处理
— Could you tell me ______?
— I live in Yan'an.[ ]
A: where you lived
B: where were you born
C: where you live
D: where you were born
()不属于农用地分等单元划分方法。
A.叠置法
B.地块法
C.网格法
D.标准样地法
