【单选题】如果要提升含碳量<0.8%合金钢的切削性能,以下热处理方式中最佳的是< /div>
【简答题】The goods will be shipped _______ October
4.A. in B. to C. on D. with
【单选题】When will the ordered goods be delivered?
A.
Before the mid of June.
B.
Before the end of June.
C.
At the beginning of June.
【单选题】Merchandise ______ are goods sent out of a country A. imports B. exports C tangible goods D. intangible goods
【判断题】作为主要的传动部件之一,轴的材料较多采用碳钢和合金钢 ,而经常采用热处理的方式提高抗疲劳强度,常用热处理方式如 淬火、 渗碳和氮化 等,以及表面强化处理,如喷丸或滚压。
【简答题】看图,补全单词。 1. 2. 3. 4. 5. b c cle c shi h t l cl k uck