问题
单项选择题
焊条电弧焊焊机的一次电源线，长度一般不宜超过（）米。
A.20~30m
B.5~10m
C.50~100m
D.2~3m
答案
参考答案：D
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焊条电弧焊焊机的一次电源线，长度一般不宜超过（）米。
A.20~30m
B.5~10m
C.50~100m
D.2~3m
参考答案：D
| 在短文的空白处选择方框中词的适当形式填空，补全短文。 | |
magic 1______. They were very 2______. Now everyone is mad about magic. We all want to know how to do a trick ! Liu didn't go to any 3______ school. He learned by 4______. He worked hard at it. Now he is a great magician. When Liu was seven, he saw a coin trick in a big store. At that moment Liu 5______ to learn magic. Liu practiced hard to 6______ his skills. Then one day he was 7______ to put on a show for his class. "I saw the 8______ on everyone's face. It was cool." Liu still practices hard today. He may spend three years working on a new show. |