下列哪一项检测结果表明胎儿或胎儿器官已成熟() ["B超测得胎头双顶径值为8cm","羊水中卵磷脂/鞘磷脂为1.8","羊水中肌酐值为180μmol/L","羊水中胆红素类物质值为0.05","羊水中淀粉酶值为400U/L"]
绿色食品是指() ["绿色的植物食品","无污染、安全、优质的营养类食品","有机农业的产品","无公害的食品","以上都不是"]
真菌培养一般需要时间为() ["少于1周","1~3周","3~6周","2个月"]
生理情况下脑血流量对下列哪项因素的变化最敏感()。 ["中心静脉压","平均动脉压","动脉血氧分压","动脉血二氧化碳分压","血pH值"]
关于水痘的流行病学特点哪项是正确的() ["传染性强,婴幼儿易感","病后免疫力大多不强","带状疱疹病人是最主要的传染源","主要通过血液传播","夏秋季节常见"]
如何诊断重症肌无力?