A:where
B:that
C:which
D:on which
( 1 )求椭圆的方程.
用20分度的游标卡尺测量某工件的内径时,示数如图甲所示,由图可知其长度为____ cm;用螺旋测微器测量某圆柱体的直径时,示数如图乙所示,由图可知其直径为____ mm.