在卧式铣床上加工蜗轮,如果用盘形齿轮铣刀对蜗轮齿坯进行粗加工,那么,可以用()对齿坯进行精加工。
A.指状铣刀
B.蜗轮滚刀
C.飞刀
参考答案:B
短文填空。
I'm a (1)m school student. I go to school (2)e morning except (除了) (3)S
and Sundays. My home is (4)n the school so I (5)w to school. I have to (6)g
up early. School (7)s at 8:00 and finishes at 4:30 pm. I (8)u play basketball with my friends. I like it very
much. I think Yao Ming is the (9)b player in China. I (10)w I could be a good player like him.
对氨基苷类抗生素无效的细菌是
A.绿脓杆菌
B.肠球菌
C.厌氧菌
D.变形杆菌
E.结核杆菌