单项选择题
A.1.5米B.1米C.0.5米D.无所谓
A.学历证书和上岗证 B.电工证和登高证 C.资格证书和上岗证 D.学历证书和资格证书
A.tracert B.ipconfig C.ping D.nslookup
A.trace route B.tracert route C.traceroute route D.trace route
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