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【单选题】
甲设计单位自行研发的异型特种结构设计技术获得国家专利，单位投资700万元建设某一必须使用该专利技术的旅游项目。则对该项目设计任务的发包方式表述正确的是( )。A.
因施工合同估算价超过200万元，故必须公开招标
B.
采用特定的专利技术，经有关主管部门批准后可以直接发包
C.
关系社会公共利益的项目，即使采用特定的专利技术也不能直接发包
D.
若其设计费超过50万元必须公开招标
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皮皮学刷刷变学霸
举一反三
【简答题】压力继电器是一种将油液的压力信号转换为( )的电液控制元件。
【多选题】What are the advantages of the OSI reference model?( )
A.
The OSI reference model provides compatibility between devices and A standard interface that facilitates standardization
B.
An important feature of the OSI reference model is its layered architecture. The layered design method can
C.
The OSI reference model is a theoretical description of the information transmission process that occurs between network devices and defines how each layer of functionality can be achieved through hardware and software
D.
neither of the above statements is true
【多选题】What are the advantages of the OSI reference model?( )
A.
The OSI reference model provides compatibility between devices and A standard interface that facilitates standardization
B.
The OSI reference model is a theoretical description of the process of information transmission that occurs between network devices and defines how each layer of functionality can be achieved through hardware and software
C.
An important feature of the OSI reference model is its layered architecture. Hierarchical design approach can transform large and complex problems into several smaller and manageable problems
D.
neither of the above statements is true
【单选题】关于电容式传感器,下面说法正确的是( )
A.
变极距式可以测大的位移，因为变极距式灵敏度高
B.
平板电容器测量液面变化称为变面积式传感器
C.
变极距式灵敏度高、小范围内可近似认为是线性，适合于测量微位移
D.
测量湿度可以利用变极板间距的类型
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