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【单选题】
气象学中,能见度用气象光学视程表示。气象光学视程是指:A.
白炽灯发出色 3000K 的平行光束的光通量，在大气中削弱至初始值的 10% 所通过的 路径长度
B.
白炽灯发出色 2700K 的平行光束的光通量，在大气中削弱至初始值的 5% 所通过的路
C.
白炽灯发出色 2500K 的平行光束的光通量，在大气中削弱至初始值的 5% 所通过的路
D.
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反馈参考答案：
举一反三
【判断题】The author visited Rainy Mountain for the only purpose of mourning his grandmother.
A.
正确
B.
错误
【判断题】the author visited Rainy Mountain for the only purpose of mourning his grandmother.
A.
正确
B.
错误
【判断题】The author visited Rainy mountain for the only purpose of mourning his grandmother.
A.
正确
B.
错误
【判断题】Businesses exist for the only purpose of making profits and creating wealth for the owners.
A.
正确
B.
错误
【单选题】To _______ the profit should not be the only purpose of a company.
A.
maintain
B.
stimulate
C.
maximize
D.
stir
相关题目：
【判断题】The author visited Rainy Mountain for the only purpose of mourning his grandmother.
A.
正确
B.
错误
【判断题】the author visited Rainy Mountain for the only purpose of mourning his grandmother.
A.
正确
B.
错误
【判断题】The author visited Rainy mountain for the only purpose of mourning his grandmother.
A.
正确
B.
错误
参考解析：
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