证券回购协议实际上是（）。
A.证券买卖
B.短期借贷
C.有抵押的证券买卖
D.有抵押的短期借贷
参考答案：D
有关上尿路结石的临床表现，下列哪项是错误的
A．结石可引起钝痛或酸痛
B．结石越大，越易引起疼痛
C．可引起肉眼和镜下血尿
D．伴感染时可有尿频，尿痛等症状
E．双侧或孤立肾上尿路结石完全梗阻可无尿
The manager or his assistant _____ planning to go. [ ]
A. was
B. are
C. were
D. be
