A. when the woman was not well with herself. B. when surgical procedures were unsafe. C. when the mother requested to have one. D. while the family was in financial straits. 参考答案:A 答案解析:[题解] 根据提问,只有两种情况,才能实施堕胎:一是危及产妇生命,二是有害产妇健康。可以参见原文中句子:commonly stipulating a threat to the woman's lif
第4题: [单项选择]检查肝细胞癌的病灶内血流,用哪一项彩色多普勒技术最简便有效() A. M型彩色多普勒 B. 彩色多普勒血流成像 C. 频谱多普勒 D. 彩色多普勒能量图与超声造影并用 E. 以上都不是 参考答案:D 答案解析:原发性肝细胞癌病灶内的血流常表现为丰富的动脉样血流信号,且流速一般较快,阻力指数以低阻型为多,但也现较高或高阻型,此时选用彩色多普勒血流成像和彩色多普勒能量图均少。而转移性肝癌血流一般出现在瘤体外围处,流速较低,彩色多普勒显示率不高,此时选用彩色能量多普勒比较有效。超声造影能显明提高肝癌(原先性或转移性)血流的检出率。