发射人造卫星是将卫星以一定的速度送入预定轨道.发射场一般选择

发射人造卫星是将卫星以一定的速度送入预定轨道.发射场一般选择在尽可能靠近赤道的地方,如图.这样选址的优点是,在赤道附近(    )

A.地球的引力较大                                B.地球自转线速度较大

C.重力加速度较大                                D.地球自转角速度较大

答案

B

解析:

发射场一般选在赤道附近的原因是此处线速度较大,卫星可借助于此速度,减小发射需要的能量.

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