【单选题】下列哪一项不是细胞体外培养的必需条件( )
【判断题】If a first complaint letter does not bring action, we should assume a much stronger one with threat of legal action.
【判断题】护理员起主导作用,老年人只需要配合护理员操作就好了,不需要其思考和参与。
【单选题】会议对已确定的议题列出先后顺序称为 ( ) 。
【单选题】When I (got to) the cinema, the film (had already started) I (ought to get) there (earlier).
【单选题】When I (got to) the cinema, the film (had already started); I (ought to) get there (earlier).
【单选题】下面表达式可以保留两位小数,并且四舍五入的是()