血栓外痔形成的原因是:() ["静脉曲张造成","反复炎症使血液淤滞而成","腹压增加使肛门部痔下静脉破裂,血瘀皮下而成","腹压增加使肛门部动脉破裂,血瘀皮下而成","以上均不对"]
混合痔手术的一般治疗方法是:() ["切除术","结扎术","注射术","枯痔法","外痔剥离内痔结扎术"]
静脉丛切除术的适应证是:() ["内痔","血栓外痔","静脉曲张性外痔","混合痔的内痔部分","内痔和混合痔的内痔部分"]
硬化注射疗法的主要作用机制是:() ["使痔核湿性坏死","使痔核纤维化萎缩","使痔核坏死脱落","全部阻断痔血流","畅通痔血流"]
农民自繁、自用的常规种子有剩余的,在集贸市场上出售,()办理林木种子经营许可证。 ["A、需要","B、不需要"]
变压器温度表所指示的温度是变压器什么部位的温度?运行中有哪些规定?温度与温升有什么区别?