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【单选题】
图示结构杆1的轴力（以拉为正）为【图片】A.
-F
B.
-F/2
C.
0
D.
F/2
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举一反三
【单选题】列关于业主享有的权利,说法错误的是( )
A.
业主有选定工程总设计单位和总承包单位，以及与其订立合同的签定权
B.
业主有对工程规模、设计标准、规划设计、生产工艺设计和设计使用功能要求的认定
C.
监理单位调换总监理工程师可以不经过业主同意
D.
业主有权要求监理机构提交监理工作月度报告及监理业务范围内的专项报告
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