退刀槽和越程槽的尺寸标注可标注成( )。
A．槽深×直径
B．槽宽×槽深
C．槽深×槽宽
D．直径×槽深
参考答案：B
下图中属于神经组织的是[ ]
A．
B．
C．
D．
When the farmers dug the well, they _____ a large collection of ancient china. [ ]
A. came by
B. came around
C. came up
D. came across
