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搜题
【单选题】
克定律揭示了（）A.
黑体辐射力与热力学温度的关系
B.
黑体辐射能按波长分布的规律
C.
吸收比与发射率之间的关系
D.
黑体辐射能沿空间不同方向分布的规律
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皮皮学刷刷变学霸
举一反三
【单选题】The first compass, called a sinan, was invented __________.
A.
in the Han Dynasty
B.
in the Western Zhou Dynasty
C.
in the Shang Dynasty
D.
during the Warring States Period
【单选题】According to ancient records, natural magnets were employed in China as direction-finding devices. This led to the first compass, called ( ) during the Warring States Period.
A.
Si Nan
B.
wet compass
C.
dry compass
D.
navy compass
【单选题】According to ancient records, natural magnets were employed in China as direction-finding devices. This led to the first compass, called ( ) during the Warring States Period.
A.
wet compass
B.
Si Nan
C.
dry compass
D.
navy compass
【简答题】为80C51单片机扩展行列式按键，1个并行口最多可以扩展______个按键。
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