癫痫小发作的表现有（） ["两目上吊数秒至数分钟即可恢复 ","动作中断，手中物体落地 ","四肢抽搐，项背强直 ","突然昏倒，不省人事 ","头突然向前倾下，迅速抬起"] 某物质的肾阈是指（） ["该物质的最大滤过率 ","该物质的最大分泌率 ","该物质的最大重吸收率 ","该物质开始在尿中出现的血浆浓度 ","该物质在尿中出现的血液浓度"] 恶性肿瘤一般不转移至（） [" ","心 ","肝 ","肾 ","脑 ","骨"] 急性肾功能衰竭的预防措施有（） ["手术前充分纠正水和电解质失调 ","积极治疗引起肾小管坏死的原发病 ","及时纠正肾血流量不足 ","合理使用氮基糖苷类抗生素和利尿剂 ","使用大剂量造影剂 "] 麻黄治疗风寒表实证，常与其相须为用的药物是 ["荆芥","防风","香薷","桂枝"] 外感风寒挟湿之头痛，身痛等表寒重证，首选