从思想渊源的角度来看，以下哪一项属于经济学的起源：（）
A、古印度宗教学
B、古希腊家政学
C、古巴比伦建筑学
D、古埃及种植学
参考答案：B
With the help of modern technology,the farmers have got twice________as they did before. [ ]
A. as much corn
B. much corn as
C. corn much as
D. corn as much
橡塑绝缘电力电缆线路油压示警系统，控制电缆线芯对地绝缘电阻（MΩ）与被测电缆长度（km）的乘积值（）。
A.大于等于1
B.大于等于2
C.大于等于3
D.大于等于4
