A:家鸡的光腿和毛腿
B:玉米的黄粒和圆粒
C:绵羊的白毛和黑毛
D:豌豆的高茎和矮茎
某几何体的三视图如图所示,则该几何体的体积为( )
长江三角洲地区与城市带发育不相关的自然因素是( )
读日本某山图片,回答问题。
It's difficult for the village children to cross the river to get to school. We think a bridge________ over the river