稀浆封层使用的乳化沥青可采用慢裂或中裂的拌合型乳化沥青,当需要减缓破乳速度时,可掺加适量的( )作外加剂。
A.水
B.消石灰粉
C.气化镁
D.氧化乳
参考答案:D
Which of the following is NOT an assumption of the constant growth dividend discount model (DDM)()
A. The growth rate of the firm is higher than the overall growth rate of the economy.
B. ROE is constant.
C. Dividend payout is constant.
下列子宫肌瘤病理特点和声像图的表现,哪一项是错误的()
A.肌瘤由平滑肌与纤维结缔组织交叉组成
B.肌瘤周围有被压缩的肌纤维所组成的假包膜
C.假包膜与肌瘤间有疏松的结缔组织
D.肌瘤变性时,声像图可为圆形无回声区
E.肌瘤结节多呈圆形无回声区