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【单选题】
晶闸管低同步调速系统工作时，晶闸管有源逆变器的触发超前角β一般为（）。A.
30～60度
B.
30～90度
C.
60～90度
D.
30～120度
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【简答题】读句子或对话选择对应的图片。 ( ) 1. Look at the elephant. It's big. B. ( ) 2. The giraffe is tall. C. ( ) 3. Where is the bird? It's in the box. D. ( ) 4. Look at the panda. It's cute. E.
【简答题】阅读理解。 The Giraffe The giraffe is the tallest modem land animal. It can be over 5.5 metres tall. Its neck bone may be 1.9 metres long. Yet the giraffe has only seven bones (骨) in its neck, the same num...
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