轴承退卸时应保证压力机活塞()与车轴中心在同一直线上。
A、中间
B、中央
C、中上
D、中心
参考答案:D
— I was told to be here before 6:00 p.m.
— Oh, you . I felt sorry for you that we've changed the plan. [ ]
A. can't; not telling
B. needn't; not telling
C. can't; not to tell
D. needn't; not tell
白血病可用()
A.后装治疗
B.电子线治疗
C.两者均可
D.两者均不可