轴上零件固定方法中()可以周向、轴向同时固定,在过载时有保护功能,轴和轴上零件不会损坏。
A、键连接
B、销钉连接
C、紧定螺钉
D、过盈配合
参考答案:B
Nicolaus Copernicus’ discovery about the universe is ______, which ______later achievements in astronomy science. [ ]
A. ambitious; gave birth to
B. enthusiastic; resulted in
C. obvious; resulted in
D. revolutionary; led to
下列药物中,一般不用于转移性骨肿瘤治疗的是()
A.
B.-EDTMP
C.-HEDP
D.-HEDP
E.131I-IC