主要作用于革兰阴性菌的半合成青霉素是() ["青霉素v","哌拉西林","匹氨西林","替莫西林","双氯西林"]
黄芪除补气升阳,益卫固表,利水消肿外,还有的功效是()。 ["润肺止咳","生津止渴","清火生津","托毒生肌","止汗安胎"]
肉眼鉴别特征为体壁柔软,体色桃红,体躯伸展,血液浑浊的真菌性疾病是() ["蜜蜂白垩病","家蚕质型多角体病","欧洲幼虫腐败病","白僵病","家蚕核型多角体病"]
功能补脾肺气,补血生津的药物是()。 ["黄芪","党参","山药","甘草","白术"]
试分析《短歌行》的语言特征?
《龟虽寿》表达了作者怎样的思想感情?