A.hj=Lm B.hj=Lm+h2 C.hj=Lm+2h2 D.hj=Lm+3h2
A.j=ms B.j=αms C.j=2αms D.j=3αms
A.5~10倍 B.10~15倍 C.15~20倍 D.20~25倍