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【单选题】
用频率为 的单色光照射某一种,测得光电子的最大动能为 ;用频率为 的单色光照射另一种,测得光电子的最大动能为 。如果 ,那么[ ]A.
一定大于
B.
一定小于
C.
一定等于
D.
可能大于也可能小于
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【单选题】听力原文： Today when a man steps on to the moon, or something new and important happens, the world learns about it immediately. What did the newspapers say about that first flight in 19037 Strangely enoug...
A.
They were able to fly it in the air.
B.
They were able to stay up in the air for half an hour and more in the machine.
C.
They were able to carry travelers.
D.
They were 'able to fly in mound Dayton.
【单选题】听力原文： Today when a man steps on to the moon, or something new and important happens, the world learns about it immediately. What did the newspapers say about that first flight in 1903? Strangely enoug...
A.
They were able to fly it in the air.
B.
They were able to stay up in the air for half an hour and more in the machine.
C.
They were able to carry travelers.
D.
They were able to fly in around Dayton.
【单选题】听力原文： Today when a man steps on to the moon, or something new and important happens, the world learns about it immediately. What did the newspapers say about that first flight in 1903? Strangely enoug...
A.
They were able to fly it in the air.
B.
They were able to stay up in the air for half an hour and more in the machine.
C.
They were able to carry travelers.
D.
They were able to fly in around Dayton.
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