岩土工程初步勘察阶段，当基础下有厚度超过（）且分布均匀的坚实土层，一般勘探孔深度可适当减少？ ["3~5m；","2~4m；","5~7m；","大于5m；"]
工资集体协商的含义是什么?
闭合性气胸肺压迫()％可无症状 ["10","20","30","40","50"]
同一土层呈韵律沉积，当薄层与厚层的厚度比小于1/10时，应描述为： ["互层；","夹层；","夹薄层；","交错层；"]
成人头、面、颈部全部烧伤，其面积约为全身面积的() ["3％","6％","9％","18％","20％"]
请简述工资指导线的作用。
