碳素结构钢在常温下主要由铁素体和渗碳体所组成。()
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【C17】
A. another
B. others
C. the others
D. the other
DDA算法仅适用于直线的斜率绝对值小于1的直线生成。()
【C15】
A. as a matter of fact
B. more often than not
C. until this day
D. believe it or not
【C14】
A. challenge
B. task
C. result
D. mistake