每个机框上方的风扇电源连线与（）连接，获得电源。
A.PDU单元
B.GPB板
C.SCB板
D.外部电源供电
参考答案：C
《二泉映月》是华彦钧创作的一首____.
A．京胡
B．板胡 .
C．二胡
D．古筝
看看你的应变能力，用所给单词的适当形式填空。
1. Today is June 1, it's________(child)Day.
2. My favourite subject is social______(study).
3. There are lots of______(sheep) on the hill.
4. He_______ (study) very hard when he was young.
5. She is a _____(Canada).
