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【单选题】
氧枪喷头端部被侵蚀的主要原因是（）。A.
枪位正常但炉内温度高
B.
喷头端部粘钢，降低喷头熔点
C.
氧枪在炉内泡沫中吹炼时间长
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反馈参考答案：
举一反三
【单选题】下列关于黄土的叙述,正确的是( )
A.
黄土很黏重，土质呈酸性，是低产土壤之一
B.
黄土由较细的粉沙颗粒组成，便于耕作
C.
黄土富含氮、磷、钾等养分，比较贫瘠
D.
黄土是人工土壤，是由于人类长期耕作形成的
【单选题】Which of the following sentences does NOT mean the movie is funny?
A.
The movie is full of gags.
B.
The movie has a lot of punch-lines.
C.
The movie cracks me up.
D.
This is a A-list movie.
【简答题】股权众筹的运营模式一般可以分为三类,请简要说明。
【单选题】Which of the following sentences does NOT mean the movie is funny?
A.
The movie is full of gags.
B.
The movie has a lot of punch-lines.
C.
The movie cracks me up.
D.
This is an A-list movie.
【单选题】Which type of movie might the speakers see?
A.
A comedy.
B.
A sad movie.
C.
A scary movie.
【单选题】____ with a camera a compass and several maps , the scientists set out to explore the ancient forest.
A.
Equipping
B.
Having equipped
C.
Equipped
D.
To be equipped
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