皮皮学，免费搜题
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搜题
【单选题】
手工钨极氩弧焊机分为:( )、交流手工钨极氩弧焊机、交直流手工钨极氩弧焊机和手工钨极脉冲氩弧焊机。A.
直流手工钨极氩弧焊机
B.
逆变钨极氩弧焊机
C.
高频脉冲钨极氩弧焊机
D.
数字钨极氩弧焊机
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】When should a letter be considered obligatory?
A.
When you make friends.
B.
When you receive a gift.
C.
When you want to visit your friends.
D.
When you haven't answered a letter for a long time.
【简答题】A．When you are applying for a job. B．When you are paying your tuition fee. C．When you are riding a bus. D．When you are interviewing candidates.
【单选题】When should a letter be considered obligatory?
A.
When you make a good friend.
B.
When you receive a gift.
C.
When you want to visit your friends.
D.
When you haven't answered a letter for a long time.
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