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What is the minimum period of time that the air supply for a self-contained breathing apparatus is required to last?________.
A.10 minutes
B.20 minutes
C.30 minutes
D.90 minutes
参考答案
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在 Windows 中，运行（ ）命令得到下图所示结果。以下关于该结果的叙述中，错误的是（ ）。
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Reply from 59.74.111.8: bytes=32 time=5ms TTL=60
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