皮皮学，免费搜题
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【多选题】
焊接性包括A.
工艺焊接性
B.
操作焊接性
C.
材料焊接性
D.
使用焊接性
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
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【简答题】Grammar Review Fill in the blanks with the proper forms of the words given in the brackets. With Mr. Smith (take)the lead, they decided to set up a trading company
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