什么叫切削用量?
参考答案:
就是切削速度进给量和切削深度的总称。
—Have you ever heard of Dolly, the cloned sheep?
—Yes, she _____ in Scotland a few years ago. [ ]
A. created
B. was discovered
C. was created
D. creating
读图,对我国四大区域特征的分析正确的是 ( )
A.A区——河湖众多,水网纵横
B.B区——沙漠广布
C.C区——以牧业为主
D.D区——多水田,适合种水稻