题目内容
光缆的型号为：GYTA53 12A1+5×4×0.9,写出其含义。
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光缆的型号为：GYDTA 24B4，写出其含义。
In this conversation, two students are talking about the courses they will take. Listen carefully, and fill in the gaps with one word or one number.[音频]Ann and Bob are discussing what they need to take for their area of ______.
Bob is going to take ______.
Ann wants to study how the ____ was formed.
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