【单选题】为了预防产后出血,肌肉注射缩宫素的时间为:
【单选题】I received bad service in that restaurant. They waiter was talking on the phone while ____ my order.
【单选题】"Jack certainly has a low opinion of Susan."It can not be any worse than( )of him.
【单选题】由国家最高行政机关实施、管理教育事业,根据宪法和教育法律制定的规范性文件称为( )。