【名词&注释】
奥氏体不锈钢(austenitic stainless steel)、耐热钢(heat resistant steel)、空间波(space wave)
[单选题]短波的主要传播方式()。
A. A、地波
B. B、天波
C. C、空间波
D. D、散射波
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学习资料:
[单选题]The supply chain activities encompass all associated with the flow and transaction of goods, the flow of information from the raw materials supplier to the end user, as well as the reverse flow of materials and in formation in the()
A. Distribution process
B. Supply chain
C. Enterprise
D. International community
[单选题]再生塔重沸器管子、管板和管箱,为适合工艺条件使用,制造材料最好选用()
A. 低合金钢
B. 奥氏体不锈钢
C. 碳钢
D. 耐热钢
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