从学科根源上看,现代政府经济学发源于()。
A.政治学
B.财政学
C.社会学
D.统计学
参考答案:B
I _____ the newspaper while my mother _____ TV plays yesterday evening.
A.was reading; was watching
B.was reading; watched
C.read; was watching
D.read; would watch
汽轮机正常停车时,可直接打闸停机。