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【判断题】
使用ping命令可检查网络的连通性以及测试与目的主机之间的连接速度。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】Section A Directions: In this section, you'll hear five short conversations. After each conversation, a question will be asked about what was said. The conversation and question will be read only once...
A.
30 dollars.
B.
40 dollars.
C.
50 dollars.
D.
60 dollars.
【单选题】Section A Directions: In this section, you'll hear five short conversations. After each conversation, a question will be asked about what was said. The conversation and question will be read only once...
A.
14:20.
B.
14:00.
C.
14:40.
D.
14:30.
【简答题】知数列 的通项公式是 ,那么 是这个数列的第 项 .
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