下列哪种物质具有较高的声阻抗系数() ["固体","气体","液体","上述各项声阻抗系数相等","以上均不对"]
生长激素的促生长作用有() ["促进各种组织细胞增大和增生","促进骨和软骨的生成和成熟","使内脏体积及重量增加","促进各种细胞摄取氨基酸","促进骨骺端的骨化中心成熟"]
金融机构可以为客户开立匿名账户。()
哪一种体位可以使椎管狭窄程度减轻() ["立位","卧位","头低足高位","过屈位","过伸位"]
在“顾夏虫而却笑”中,“却”之义为() ["后","再","退","止"]
可以使环孢素浓度上升的药物为()可以使环孢素浓度下降的药物为()