底面

• He got his chair bottomed .
  他让人给他的椅子装了底面。
• He connected metallic wires to the back and the underside of an electrical fish .
  他在电鱼的背面和底面联上金属线。
• Alternatively it may be solely a method of forming a suitable background for painting .
  也可能是为了使油漆有个适宜底面。
• B 、 what shape is the flank of a taper
  圆锥的底面是（ ）形，圆锥有（ ）个底面。
• Light test capability : top , bottom and side
  能迎合顶面、底面或侧面放射的光电产品。
• A box has a top , a bottom and four sides
  盒子有顶面、底面和四个侧面
• Sapphire glass on the top and on the bottom ,
  ，蓝宝石表面与表底面。
• " is stamped on its lateral side
  2地板底面有钢印标志“红日” 。
• Well done ! this is called point . this circle is called underside
  师：很好，这个点叫做顶点。这个圆叫做底面。
• Slide block underside size mm
  滑块底面尺寸mm