第三代海事卫星采用同步和中轨道卫星结合的方案，解决了覆盖全球

第三代海事卫星采用同步和中轨道卫星结合的方案，解决了覆盖全球的问题。它由4颗同步卫星与12颗中轨道卫星组成的卫星群构成，中轨道卫星离地面的高度约为地球半径的2倍，分布在几个轨道平面上（与赤道平面均有一定的夹角）。若地球表面处的重力加速度为，则中轨道卫星的轨道处受地球引力产生的重力加速度约为（）

A．

B．4g 　　

C．

D．9g

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Supposing you _________ the lottery, what would you do with the money?

A．would win	B．have won
C．had won	D．won

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---What’s your comment on the match?
--- we ________, but today was not our day.

A．need have scored	B．could have scored
C．should score	D．would score

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If my lawyer ______ here last Saturday, he ______ me from going.

A．had been; would have prevented

B．had been; would prevent

C．were; would prevent

D．were; would have prevented

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______ the good chance to get promoted then, he would be a sales manager now.

A．If he seized	B．If he were to seized
C．If he had seized	D．If he should seize

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They were abroad during the months when we were carrying out the investigation, or they _____ to our help.

A．would have come	B．could come
C．have come	D．had come

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