单项选择题
（ ） includes obvious symbols or words to warn people against the hidden danger of inflammables, explosives and poisonous products.
单项选择题 【多选题】内部员工推荐包括（ ）
未知题型 8. Because of its great popularity, the book has been translated into several languages for ____(出版).
单项选择题 大面积烧伤病人转运前应首先（）
