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The light bulb_________ (be) invented by Thomas Edison.

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The film__________ (have) been on for five minutes.

Students should__________(learn) to look up new words in dictionaries.

I __________ (can) ride the bike when I was 6 years old.

4p亚层中轨道的主量子数为,角量子数为,该亚层的轨道最多可以有种空间取向,最多可空纳个电子。