下列方程是二元一次方程的是 [ ]
A.3x﹣1=xy
B.4x2+3x=0
C.2+y=3
D.3x=y
答案:D
________ several times, Bill made up his mind not to watch late night movies any more.
A.To be blamed
B.Having blamed
C.To blame
D.Having been blamed
肾其华在()
A.气血辨证
B.阴阳辨证
C.表里辨证
D.虚实辨证
E.寒热辨证