订立建设工程合同的行为，属于()。
A. 实践性法律行为
B. 特定法律行为
C. 要式法律行为
D. 不要式法律行为
为明确病因，首选检查
A. 骨髓穿刺、尿本周蛋白检查
B. 双肾B超
C. 腹部平片
D. 静脉肾盂造影
E. 24小时尿蛋白测定
Public goods______.
A. are run by the government because they are very profitable
B. are such that the more people use them, the more it costs to provide
C. are such that they cannot be excluded from any consumer's use
D. are goods like airline travel
代位追偿原则主要适用于下列哪种保险？()
A. 责任保险
B. 财产保险
C. 意外险
D. 个人寿险
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