档距为60m的低压配电线路，导线间距离应不小于：()

It is suggested in Paragraph 1 that 'behavioral' ads help advertisers toA．ease competition among themselves.B．lower their operational costs.C．avoid complaints from consumers.D．provide better online services. 点击查看答案

It can be learned from Paragraph 1 thatA．Science intends to simplify its peer-review process.B．journals are strengthening their statistical checks.C．few journals are blamed for mistakes in data analysis.D．lack of data analysis is common in research projects. 点击查看答案