抗链“O”试验可辅助下述哪种疾病的诊断
A．风湿热
B．肠热症
C．类风湿关节炎
D．猩红热
E．红斑性狼疮
参考答案：A
泪道功能不全的原因不包括()
A．面神经麻痹
B．泪小点闭塞
C．鼻泪管瓣膜功能不全
D．痉挛性睑外翻
E．老年性下睑松弛
Given investors require an annual return of 12.5 percent, a perpetual bond (i. e. , a bond with no maturity/due date) that pays $ 87.50 a year in interest should be valued at :（）
A. $1093.
B. $875.
C. $700.
