【判断题】物料中含有水分时,筛分效率和筛分生产率都会降低。
【单选题】The government work report by Premier Wen covers a variety of issues,and social justice . [ ]
【判断题】Social
issues have a very wide scope, and vary among countries. That is, different
countries have different social issues in specific. Social issues can be local,
national or international.
【简答题】如图所示,已知AB∥CD,∠1=70°则∠2=( ),∠3=( ),∠4=( )。
【单选题】水分生产率是集中反映作物对水分利用效率的一项综合性指标,是指()除以单位面积平均净灌溉水量与有效降水量之和的比值。
【简答题】如图所示,∠A=60°,则∠1+∠2+∠3+∠4=______.
【简答题】如图所示,直线AB∥CD,∠2=67°,则∠1=( ),∠3=( ),∠4=( ).
【单选题】_______ formal occasions, you should talk about some world issues or social problems, not about yourself or your family.