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【多选题】
焊条按其药皮性质可以分为酸性焊条和碱性焊条两大类,下列各选项中对于这两类焊条的描述错误的是( )A.
用酸性焊条焊成的焊缝抗裂性及强度好，适合焊接重要的结构钢和合金结构钢
B.
酸性焊条的工艺性能和抗气孔性能差
C.
对存在铁锈、油污和氧化物且不宜清除的位置，宜选用酸性焊条
D.
在使用碱性焊条时要烘干焊条除去水分并采用直流电源
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【简答题】电气图用图形符号由哪些部分组成?
【单选题】I hope that ______ that I’ve been able to do is of some use to you.
A.
a few
B.
the few
C.
a little
D.
the little
【单选题】---- I promise I will work harder this term, Miss Li. ----Well, just as the saying goes, “_____”I do hope that you will act soon.
A.
It never rains but pours.
B.
Many hands make light work.
C.
Actions speak louder than words.
D.
A fiend in need is a friend indeed.
【单选题】a. We are having just a few friends over and it will be very informal, so there is no need to dress up. b. I would like to invite you to a small house-warm...
A.
a-b-c
B.
b-c-a
C.
b-a-c
D.
c-b-a
【单选题】I hope that the little_I have been able to do has been good for you A. which B. that C. what D. for which
A.
B.
C.
D.
D
【简答题】电气简图用图形符号主要由 、 和 组成。
【单选题】I hope that you can come and celebrate the Spring Festival with my family.
A.
do
B.
did
C.
does
D.
done
【简答题】电气图用图形符号由 、 、 、 组成。
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