订立和变更劳动合同,应遵循的原则是什么?
下列哪项与肺顺应性降低与无关() ["肺血流","深吸气","表面活性物减少","肺不张","肺纤维化"]
视网膜的光感受器与下列哪项电生理检查相对应() ["EOG","ERG的a波","ERG的b波","ERG的Ops波","图形ERG"]
以下各项不能产生递延所得税的是()。 ["A、国债的利息收入","B、计提减值准备","C、会计折旧期限与税务规定期限不一致","D、交易性债券投资公允价值发生变动"]
青光眼的早期视野缺损表现为() ["象限盲","鼻侧阶梯","同侧偏盲","颞侧偏盲","向心性视野缩小"]
劳动合同的概念?