【单选题】轴类零件在一台车床上车端面、外圆和切断。此时工序为( )。
【简答题】Vocabulary and structure Directions: Compare each pair of words and complete the following sentences with the right one. Change the form if necessary. draw, drawing 1. _____ has never been my interest...
【简答题】下图表示人体内免疫细胞组成的概念图,据图回答: (1)人体内的免疫细胞是由骨髓中的______分化形成的,各种免疫细胞形态和功能不同,根本原因是_______的结果。 (2)既能参与非特异性免疫,又能参与特异性免疫的细胞属于图中的____(填数字),在特异性免疫中该细胞的作用_______。 (3)图中所示的以下细胞中,具有增殖分化能力的有_____。 A.记忆细胞 B.② C.③ D.④...
【简答题】Directions: Compare each pair of words and complete the following sentences with the right one. Change the form if necessary. reading, readable The words and numbers in the table should be clearly ___...