【单选题】Recently, a possible alternative way of producing paper has been suggested by agriculturalists and environmentalists: a plant called hemp. Hemp has been cultivated by many cultures for thousands of ye...
【多选题】关于环境质量标准和污染物排放标准,下列哪些说法是正确的?
A.
国家环境质量标准是制定国家污染物排放标准的根据之一
B.
国家污染物排放标准由国务院环境保护行政主管部门制定
C.
国家环境质量标准中未作规定的项目,省级政府可制定地方环境质量标准,并报国务院环境保护行政主管部门备案
D.
地方污染物排放标准由省级环境保护行政主管部门制定,报省级政府备案
【单选题】如果实际国民生产总值不变,那引起实际货币需求量增加的原因是( )。
【简答题】Wood has been used to make paper since the 19th __________(世纪).
【单选题】All these days he ______ on his paper.
【单选题】如果实际国民生产总值不变,那引起货币需求量增加的原因是()
【简答题】Before Straus presented his paper, it has already been proved that ______ may affect the development of children.
【单选题】Paper _____ the fibres of plants for many years.