不属于月经周期经常提前7天以上的病机是（）。
A.气虚不能摄血
B.阳盛迫血妄行
C.阴虚而虚热内扰
D.肝郁、血瘀，血海不宁
E.湿热蕴结
参考答案：E
尘肺诊断的主要临床依据是（）
A.职业史
B.症状与体征
C.肺功能
D.X线胸片
E.病理切片
For which of the following securities is estimating the future cash flows least difficult（）
A. 5-year, 6% bond with two years of call protection.
B. 3-year note with a coupon of Libor + 100 basis points.
C. 8% preferred stock with mandatory redemption in five years.
