All but Dick _______ in Class Three this term. [ ]
A. are
B. is
C. were
D. was
答案:A
血吸虫病性肝硬化腹水产生的因素 ()
A.白蛋白合成不足
B.门静脉压力增高
C.血氨产生过多
D.腹泻
E.脾大
简述定值保险合同的存在价值。