The word "nudge" in the first sentence of paragraph six means ______.
A. progress
B. encouragement
C. push
D. growth
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经济中由库存调整引起的周期被称为( )
A. 长周期
B. 中长周期
C. 主周期
D. 短周期
The pace of recycling will have to be artificially quickened because ______.
A. nature' s own pace is slowing down rapidly
B. the "working capital" of recycled material has all been used up
C. the earth' s resources cannot be replaced by man
D. the earth' s growing population requires more and more resources
以下属于影响行情变化之偶然性因素的是( )
A. 政治动乱
B. 科技发展
C. 季节变化
D. 经济结构
高频开关型充电装置多数采用与蓄电池( )的配置方式。
A. 一对一
B. 一对一
C. 一对三
D. 二对一
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