【简答题】某二元混合物,其中A为易挥发组分,液相组成xA=0.4,相应的泡点为t1,气相组成为yA=0.4,相应的组成为t2,则 A.t1=t2 B.t12 C.t1>t2 D.不能判断
【单选题】某二元混合物,其中A为易挥发组分,液相组成xA=0.6,相应的泡点为t1,与之相平衡的气相组成yA=0.7,相应的露点为t2,则________。
【判断题】Simple machines allow work to be done in an easier way
【单选题】______ machines have multiplied over the centuries, even the most up-to-date list must begin with simple machines.
【简答题】Inventions such as refrigerators and washing machines did much to _______ () home in the early 1900s.
【多选题】在中国金融期货交易所上市交易的股指期货品种有( )。
【单选题】某二元混合物,其中A为易挥发组分,当液相组成xA=0.6,相应的泡点为t1,与之平衡的汽相组成为yA=0.7,与该yA=0.7的汽相相应的露点为t2,则t1与t2的关系为()。
【单选题】According to the text, simple machines can do the following but
A.
allow energy to be transferred from one place to another
B.
change the distance and speed of a moving object
C.
perform the task automatically