邮储银行各级机构可以不用保管本机构受理和处理的各种信访档案资料。
参考答案：错
34．I have had some bad times before, but seldom________so helpless as now.
A．I had felt
B．have I felt
C．I have felt
D．had I felt
一女性患者因胫骨上端骨肿瘤行胫骨上端骨切除术后拟行膝关节置换治疗，选择哪种假体为好（）。
A.髁限制型人工膝关节
B.绞链式人工膝关节
C.绞链旋转式人工膝关节
D.球臼式人工膝关节
E.后稳定型人工膝关节
