钎焊材料的温度低于()℃是软钎焊。A.350 B.450 C.550 发布时间:2017-06-22 13:51 │ 来源:www.tikuol.com 题型:单项选择题 问题: 钎焊材料的温度低于()℃是软钎焊。A.350B.450C.550
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题型:单项选择题 With his blows knitted, the doctor contemplated the difficult operation he had to perform.A.succeeded inB.decided againstC.went on withD.thought deeply about 查看答案