【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。
【判断题】柏拉图主持的吕克昂学园成立,这是西方历史上最著名的古代高等学府。
【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】We've seen a marked shift in our approach to the social issues.
【简答题】强化管和普通管的区别是管程使用了螺旋弯管,其可 ______(增大or减小)流体的湍动程度,______(增大or减小)流体的传热系数,______(增大or减小)流体的传热阻力,但______(增大or减小)流体的流动阻力。
【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.