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【单选题】
GPS卫星导航系统发射两种频率的目地是供给（）频道接收机消除（）的影响。A.
单；对流层折射
B.
单；电离层
C.
双；对流层
D.
双；电离层
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【简答题】看图写出下列动词。 1. 2. 3. 4. the window the picture the light the floor
【简答题】听下面一段对话，回答第1-4题。 1. Which floor was destroyed by the fire . A. The first floor. B. The second floor. C. The third floor. 2.When was the building built? A. In 1718. B. ln 1782. C. In 1930. 3. What was ...
【简答题】A．On the first floor. B．On the second floor. C．On the third floor. D．On the fourth floor.
【简答题】根据句意及首字母提示完成单词。 1. The c________ of one floor is the floor of the next one above. 2. The teacher asked me to f_________ a c hair from the next room. 3. Remember to r___________ your hand if you have a...
【简答题】凸极式同步发电机的磁极数( ) 多或少? ,转速( ) 高或低? 。
【单选题】选择填空 ( ) 1. – Is there a study on the first floor ? -- _________ . It’s on the second floor .
A.
No, there isn’t .
B.
No, there aren’t .
C.
No, there is .
D.
No, they aren’t .
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