Who were paying the bill for them They were paying the bill ______.
参考答案:themselves
人民防空技能能在平时()中直接发挥作用。
勘查、设计合同的基本条款包括()
A.提交有关基础和文件的期限
B.质量要求
C.费用以及其他协作条件
D.工程造价