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【多选题】
助焊剂的作用，主要包括以下哪几项？A.
清除金属表面氧化物、硫化物、油和其它污染物
B.
防止在加热过程中焊料继续氧化
C.
增强焊料与金属表面的活性
D.
增加浸润的作用
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举一反三
【单选题】He doesn't make ________ clear why he w ants another job when he has a good one . [ ]
A.
this
B.
that
C.
it
D.
these
【简答题】有哪些阀可以在液压系统中作为背压阀使用
【简答题】A．He thinks it difficult to understand. B．He thinks it helpful to one's wisdom. C．He thinks it isn't useful at all. D．He has never thought about it.
【简答题】Mike is at the age of ten. He is very naughty . And he isn’t good at his lessons. One day, in one of his English classes, the English teacher asked them a question, “If you had just one day to live, w...
【简答题】有哪些阀可以在液压系统中作为背压阀使用?
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