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【判断题】
兰贝特定律指明了黑体的定向辐射力在各个方向上是相等的。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】What is the purpose of a canal lock?
A.
To keep out boats that are too large for the canal.
B.
To measure the tonnage of canal boats.
C.
To load and unload the cargo.
D.
To change the depth of the water.
【单选题】The optic disc
A.
located in the bland part of the retina
B.
is formed by the optic nerve pierces the retina
C.
is sensitive to the light
D.
fovea centralis is its center
【简答题】水沟系 c system
【单选题】S1: How many important Canals are there all over the world? S2: Two biggest canals: Panama Canal, and Suez Canal. Q: Which Canal is there in America? 0102dh107
A.
Suez Canal.
B.
Panama Canal.
C.
Panama and Suez Canal.
D.
Americal Canal.
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