关于先天畸形说法错误的是() ["孕早期缺乏叶酸可导致无脑儿","孕早期缺乏维生素B12可导致先天性心脏病","孕前补充叶酸可预防神经管畸形的初发","孕早期补充叶酸可预防神经管畸形的再发","孕期补充维生素A须慎重"]
下列哪项为清燥救肺汤和桑杏汤均具有的功效() ["清宣温燥,养阴润肺","清宣温燥,润肺止咳","清燥润肺,养阴益气","清宣凉燥,理肺化痰","清宣温燥,化痰止咳"]
联想思维的形式可分为() ["相似联想;","接近联想;","对比联想;","连锁联想;","飞跃联想。"]
根据孕期血流动力学变化,以下说法错误的是() ["血浆叶酸降低","血浆维生素C降低","血浆维生素E降低","血浆维生素B6降低","血浆生物素降低"]
细菌菌相是由共存于食品中细菌的()和相对数量构成。 ["分布","结构特征","种类","大小","形状"]
小岛清在其“国际互补原理”中指出,对外投资和对外贸易都以()原理为基础,但前者以()为起点,后者则以()为基点