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【单选题】
钢轨气压焊的加热器，火孔与钢轨表面轮廓线一般设计为（）mm的间隙。
A.
10～15
B.
24～25
C.
15～20
D.
28
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参考答案：
参考解析：
刷刷题刷刷变学霸
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【单选题】Most shoppers know the feeling. You stand in front of piles of organic produce and wonder what those premium prices are buying you over and above what you get from standard foods. Not a lot nutrition-...
A.
do not use naturally produced fertilisers
B.
produce carbon dioxide when removing weeds
C.
use high doses of weed-killer
D.
use too many resources to qualify for organic status