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问题
判断题
熔滴的喷射过度由于焊缝成形不好，所以很少采用。
答案
参考答案：
错
选择题
_____ great help, I was able to get rid of all the difficulty and succeeded.
A. Offered
B. Having offered
C. Being offered
D. Offering
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填空题
画出函数y=x
2
的图象并说明开口方向、对称轴．
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