问题
单项选择题
金刚石刀具可用于（）。
A、高速条件下精细车削及镗削有色金属及其合金和非金属材料：
B、高速切削一般零件，以提高生产率；
C、任何材料的切削。
答案
参考答案：A
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金刚石刀具可用于（）。
A、高速条件下精细车削及镗削有色金属及其合金和非金属材料：
B、高速切削一般零件，以提高生产率；
C、任何材料的切削。
参考答案：A
| 阅读下面的短文，从所给的单词中选择合适的单词补全短文。 | |
from school. Every day he gets at 6 o'clock and eats breakfast quickly, time is so limited (有限) for him. He to school by bus. Usually in the morning, many people the bus. The bus is full of (挤满) people. So, Tom decides (决定) to go to school bike. He thinks his parents will agree with him and buy a bike for him. |