【单选题】We didn't learn ______ in this lesson. [ ]
【单选题】There isn’t _____in today’s newspaper.
【单选题】—____ they have a new eraser? —No, they ____. [ ]
【判断题】Centrifugal p umps or compressors are devices that converts mechanical energy to kinetic energy.
【单选题】For immigrants, what New York used to be means nothing because_____
A.
they don't like New York at all
B.
they don't like the old things in New York
C.
they don't know much about New York's past
D.
they do not relate New York's past to their own roots
【简答题】Integer s=new Integer(9) Integer t=new Integer(9) Long u=new Long(9) 判断: (1).s.equals(t) (2).s.equals(u) (3).s==t (4).s.equals(new Integer(9))