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【判断题】
直接序列扩频系统对同步精度的要求比跳频系统低。A.
正确
B.
错误
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【简答题】Fish and chips is my favourite dish. It’s so ________.
【简答题】A. I'm a young boy. My lunch is great today! I'm having a bottle of soda, two hot dogs, and some chips. For dessert, I'm having ice cream. B. I'm a young girl. I eat lots of fruit and vegetables. I ea...
【简答题】Read and choose．（根据问句选择合适的答语。） ( )1. Who gave a book to you? ( )2．Where is the book about animal? ( )3. Can you run fast? ( )4. When did your father come back? ( )5. Do you like ch...
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