第3题: [单项选择]下列哪项疾病为低阻型血流频谱() A. 子宫肌瘤 B. 子宫腺肌症 C. 子宫肉瘤 D. 子宫畸形 E. 子宫内膜息肉 参考答案:C 答案解析:恶性肿瘤血流频谱常为高速低阻,如子宫肉瘤、子宫内膜癌,RI<0.40;子宫肌瘤血流频谱常为高速中阻,RI为0.50;子宫腺肌症为高速高阻,RI>0.50;子宫内膜息肉常为高速中阻,RI>0.40。
第20题: [单项选择]The government will pipe natural gas to the city's homes in order to ______. A. solve the problem of being short of fuel B. bring down the cost of daily life C. reduce the pollution of our capital D. keep up with the development of modern society 参考答案:C
第21题: [单项选择]网球场地的双打边线长度是()米。 A. 23.77 B. 21.52 C. 11.885 D. 8.23 参考答案:A