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【单选题】
When ______ at the ticket office, my brother and I found we didn’t have enough money to buy ticketA.
9．When ______ at the ticket office, my brother and I found we didn’t have enough money to buy tickets for ______ of us. A．arrived; the two
B.
arrived; two
C.
arriving; the two
D.
arriving; two
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【简答题】图6-8中，S打开瞬间，电压表指针反偏，试说明两互感线圈的同名端。
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