在为滑动轴承选择润滑剂时一般应考虑()等因素。 ["轴承工作范围","周围环境","工作表面","润滑装置的特点"]
哪些肠道蠕虫不能依靠粪检确诊?应选用什么方法?
续断的功效是() ["祛风湿,补肝肾,强筋骨,安胎","祛风湿,强筋骨,利水消肿","补肝肾,强筋骨,安胎","补肝肾,行血脉,续筋骨,安胎止漏","补肝肾,强筋骨,祛风湿"]
杜仲的功效是() ["祛风湿,补肝肾,强筋骨,安胎","祛风湿,强筋骨,利水消肿","补肝肾,强筋骨,安胎","补肝肾,行血脉,续筋骨,安胎止漏","补肝肾,强筋骨,祛风湿"]
下列哪组元素构成植物必需营养元素:() ["N、C、Si","P、O、Cl","K、Ca、Na","Mg、B、Al、Ca"]
聚合原料丁二烯的质量指标是什么?