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【单选题】
若i1＝10sin(ωt+30º)A，i2＝20sin(ωt－10º)A，则i1的相位比i2超前A.
－ 40 º
B.
－ 20 º
C.
20º
D.
40º
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举一反三
【单选题】You deployed new fibers in your network to replace copper spans that were too long. While reconnecting the network， you experienced network problems because you reconnected wrong fibers to wrong ports...
A.
Only use fiber in pairs.
B.
Configure root guard on your switches.
C.
Do not use fiber but use copper.
D.
Configure UDLD to pr one-way link conditions.
【单选题】金刚石的晶体结构属于 点阵, 其致密度为 。
A.
体心立方 0.68
B.
体心立方 0.54
C.
面心立方 0.34
D.
面心立方 0.74
E.
体心立方 0.34
F.
面心立方 0.52
【单选题】There seem few movies by Hitchcock ______ she wants to see, for she has seen almost all of his movies.
A.
that
B.
which
C.
who
D.
whom
【简答题】She has seen this movie 3 times. 是什么时态?
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