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【判断题】
在CO2气体保护焊施工中，为防止产生气体，减少飞溅，焊丝中必须含有适量的Si，Mn等元素以达到脱氧的目的。()A.
正确
B.
错误
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举一反三
【单选题】The basic tone of the passage can best be described as ______.
A.
bitter and resentful
B.
sour and sober
C.
helpless and relentless
D.
mattes-of-fact and down-to-earth
【简答题】Passage 49 Open-source Software.mp3:
【单选题】The basic tone of the passage can best be described as ______
A.
bitter and resentful
B.
sour and sober
C.
helpless and relentless
D.
matter-of-fact and down-to-earth
【单选题】According to the passage, which of the following is CORRECT?
A.
Being open means to tell others not only your inner feelings, but also what gives rise to these feelings.
B.
Most people don't want to become open.
C.
Telling that the present topic makes you feel bored will irritate your partner.
D.
Becoming open helps you establish credits with others.
【简答题】公路网的分布,具有一定的地区差异性,公路线网密度以 、 、 较高,公路质量以 、 为好
【单选题】According to this passage, the panda house will be open to the public at least in______.
A.
two days
B.
two weeks
C.
two months
D.
two years
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