猪传染性胃肠炎和猪流行性腹泻发生于() ["主要发生于夏季","主要发生于冬季","主要发生于夏秋有蚊子的季节","主要发生于春季","一年四季都发"]
红霉素不是下列哪些疾病的首选药物() ["白喉带菌者","骨髓炎","空肠弯曲杆菌肠炎","婴幼儿支原体肺炎","军团菌病"]
青蒿鳖甲汤与犀角地黄汤中均含有的药物是()。 ["生地、丹皮","生地、知母","生地、白芍","芍药、丹皮","白芍、知母"]
关于氟喹诺酮类药物的说法不正确的是() ["抗菌谱广,抗菌力强","口服吸收好,组织药物浓度高","不良反应少","与其他药物有交叉耐药性","有较长抗菌药物后效应"]
猪乙型脑炎主要发生于() ["主要发生于夏季","主要发生于冬季","主要发生于夏秋有蚊子的季节","主要发生于春季","一年四季都发"]
煤与瓦斯突出有什么危害性?