题目内容

【题目】2014年12月31日上午9时02分(北京时间)，长征三号甲型运载火箭在西昌卫星发射中心成功将风云二号08星送入预定轨道。风云二号08星在升空后被重命名为风云二号G星，定点于99．5°E赤道上空的地球同步轨道上，将在天气预报、气候预测、军事、航天气象保障等领域发挥重要作用。据此回答下列各题。

【1】风云二号08星成功入轨时，美国东部(西五区)时间是2014年12月（ ）

A. 31日1时02分 B. 30日20时02分

C. 31日22时02分 D. 30日19时02分

【2】风云二号G星的运转速度与地面对应点的自转速度相比（ ）

A. 角速度小，线速度大 B. 角速度相同，线速度大

C. 角速度大，线速度小 D. 角速度大，线速度相同

【答案】

【1】B

【2】B

【解析】试题分析：

【1】北京时间采用的是东八区区时，比东五区区时早13个小时。故卫星入轨成功时，东五区区时为31日9：02—13=30日20：02，B正确。

【2】因发射的是地球同步卫星，因此卫星绕地公转的角速度与地球自转的角速度相同，线速度高于地面上对应的点。B正确。

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