轴承采用楔套配合时,楔套为45号钢锻制、经切削加工和表面()。
A、淬火
B、回火
C、退火
D、正火
参考答案:A
—Of the two man, who is your father?
—______ of them is my father. [ ]
A. Neither
B. Both
C. None
D. Either
()斜坡式码头一般用于水位变幅较小的河港。