因式分3x2-6x+3.
原式=3(x2-2x+1)
=3(x-1)2.
Lily jumped _____ than her sister Lucy. [ ]
A. much far
B. much farther
C. more far
D. more farther
仪表数量较少,耗气量较少的情况下,采用()供气方式。
A.小容量单独
B.复合回路
C.单回路
D.其他方式