简介：摘要：砂浆是建筑行业中一种基本的建筑材料，在建筑工程中应用十分广泛。在建筑物的各个部位，从结构到装饰，从屋面、墙面到地面，几乎无所不用。它是由胶凝材料、矿物掺合料、细骨料、水以及外加剂按一定的比例配制而成的。利用超细石粉代替部分水泥，探寻超细石粉不同取代量对预拌干混砂浆工作性能、力学性能及抗冻性能的影响，分析超细石粉对预拌砂浆各种性能的影响规律，并确定出超细石粉的最适宜取代率。

简介：　　 [摘要 ] 目的：探讨经阴道彩色多普勒超声技术声像图特点及对子宫黏膜下肌瘤的诊断价值。方法：回顾性分析 85例经手术及病理证实的子宫黏膜下肌瘤患者的声像图特点。结果：经阴道彩色多普勒超声特点为子宫肌瘤瘤体有假包膜，边界清晰，瘤体假包膜血流呈环状包绕，瘤体内血流呈条状、网状，频谱形态与子宫动脉略有不同，舒张期切迹模糊或消失，瘤体内血流阻力指数低于肌壁内子宫动脉的阻力指数。结论：经阴道彩超能清晰地显示宫腔内瘤体结构及肌瘤与子宫内膜的关系，对月经过多、经期延长患者的鉴别诊断提供了重要的信息。  　　 [关键词 ] 经阴道彩超；子宫肌瘤血流；子宫肌瘤  　 [Abstract] Objective: To investigate the sonographic characteristics of transvaginal color Doppler ultrasound and its diagnostic value for submucous myoma of uterus. Methods: the ultrasonographic features of 85 patients with submucous myoma of uterus confirmed by operation and pathology were analyzed retrospectively. Results: the characteristics of transvaginal color Doppler ultrasound were as follows: the pseudocapsule of uterine leiomyoma had a clear boundary, the pseudocapsule blood flow of the tumor was circular, the blood flow in the tumor was strip and reticular, the spectrum morphology was slightly different from that of uterine artery, the diastolic notch was blurred or disappeared, and the resistance index of blood flow in tumor was lower than that of uterine artery in muscle wall. Conclusion: Transvaginal Color Doppler ultrasound can clearly show the intrauterine tumor structure and the relationship between leiomyoma and endometrium, which provides important information for the differential diagnosis of patients with menorrhagia and prolonged menstruation.