【单选题】Fully ____________ looking after three children at home, she no longer has time to enjoy the various activities in the club.
【简答题】故人西辞黄鹤楼,烟花( )下扬州。唐李白
【单选题】实现中国梦,必须坚持______。我们将始终不渝走和平发展道路,始终不渝奉行互利共赢的开放战略,不仅致力于中国自身发展,也强调对世界的责任和贡献;不仅造福中国人民,而且造福世界人民。
【单选题】蜗轮蜗杆机构的传动比hz=ni/n2=z2/z1,其中z1是指( )