问题：
[单选题]在工程建设中,各类合同是维系参与单位之间关系的纽带。在建设工程项目合同体系中,两个最主要的节点是( )
A、业主和承包商
B、业主和勘察设计单位
C、承包商和设备材料供应商
D、业主和设备材料供应商
参考答案：
A
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