技术创新理论的代表人物有（）
A、道格拉斯-诺斯
B、马克思
C、爱德温-曼斯菲尔德
D、熊彼特
参考答案：C
However, at times this balance in nature is disturbed, _______ a number of possibly unforeseen effects.
A．resulting from
B．resulting in
C．having resulted from
D．having resulted in
用竖式计算
378÷42=
572÷26=
305÷61=
620÷58=
