铲运机按其操纵方式可分为拖式铲运机和自行式铲运机。
参考答案:错
句型转换。
1. Tom's father has a shop. (改为否定句)
Tom's father ____________ ____________ a shop.
2. There was a telephone call for me. (改为反意疑问句)
There was a telephone call for me, ____________ ____________?
3. There are some cakes on the table. (对画线部分提问)
____________ ____________ the table?
4. They want to make a project. (对画线部分提问)
____________ ____________ they want to ____________?
5. Close your eyes, please. (改为同义句)
Please keep ____________ ____________ ____________.
角膜内皮层发育来源于()。
A.内胚层
B.视泡
C.神经外胚层
D.中胚层
E.表层外胚层