问题
单项选择题
磨削()工件时,可选用白刚玉砂轮。
A.一般材料
B.淬火钢、高速钢
C.黄铜、铸件等
D.硬质合金
答案
参考答案:B
磨削()工件时,可选用白刚玉砂轮。
A.一般材料
B.淬火钢、高速钢
C.黄铜、铸件等
D.硬质合金
参考答案:B
A: Have you ever been to Lao She’s Teahouse? B: No, never. 小题1: A: OK.It’s very famous in Beijing. Many people like going there. B: 小题2: A: People can see some Beijing Opera in Lao She’s Teahouse. They can also drink tea there. B: Oh, it’s interesting. 小题3: A: I hope you will. By the way, do you know who Lao She is? B: Oh,I have read many writings of his. He is a great writer. 小题4: A: I have seen a play about one of his writings. B: 小题5:. I’ve never seen a play about his writing.
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