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【单选题】

What is the major advantage of high altitude observations?()

A、Errors due to unusual parallax are eliminated

B、The same body can be used for a fix from observations separated by several minutes

C、The declination is the only information needed from the almanac

D、The semidiameter correction of the sextant altitude is eliminated

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第3题

A、A.If the compile is successful, Utils.class is added to the source directory.  B、B.The compiler returns an invalid flag error.  C、C.If the compile is successful, Utils.class is added to the classes directory.  D、D.If the compile is successful, Utils.class is added to the bigProject directory.  

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第4题

A、A. The route is not announced.  B、B. The route is announced with community 90:1 added.  C、C. The route is announced with community 100:1 added.C.The route is announced with community 100:1 added.  D、D. The route is announced with communities 90:1 and 100:1 added.D.The route is announced with communities 90:1 and 100:1 added.  

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第5题

A、A.The code will compile without changes.  B、B.The code will compile if public Tree(){Plant();} isadded to the Tree class.  C、C.The code will compile if public Plant(){Tree();} isadded to the Plant class.  D、D.The code will compile if public Plant(){this("fern");} isadded to the Plant class.  E、E.The code will compile if public Plant(){Plant("fern");} isadded to the Plant class.  

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第6题

A、The command is accepted and the respective VLAN is added to vlan dat.  B、The command is rejected.  C、The command is accepted and you must configure the VLAN manually.  D、The port turns amber.  

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第7题

A、The command is accepted and the respective VLAN is added to vlan dat.  B、The command is rejected.  C、The command is accepted and you must configure the VLAN manually.  D、The port turns amber.  

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第8题

A、The code will compile without changes.  B、The code will compile if public Tree() { Plant(); } is added to the Tree class.  C、The code will compile if public Plant() { Tree(); } is added to the Plant class.  D、The code will compile if public Plant() { this("fern"); } is added to the Plant class.  E、The code will compile if public Plant() { Plant("fern"); } is added to the Plant class.  

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第9题

A、The code will compile without changes.  B、The code will compile if public Tree() { Plant(); } is added to the Tree class.  C、The code will compile if public Plant() { Tree(); } is added to the Plant class.  D、The code will compile if public Plant() { this("fern"); } is added to the Plant class.  E、The code will compile if public Plant() { Plant("fern"); } is added to the Plant class.  

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