已知万有引力常量G和下列各组数据,能计算出地球质量的是( ) A.已知地球绕太阳

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问题:

已知万有引力常量G和下列各组数据,能计算出地球质量的是(  )

A.已知地球绕太阳匀速圆周运动的周期T及地球离太阳的距离r

B.已知卫星绕地球做匀速圆周运动的轨道半径r和线速度v

C.若不考虑地球自转,已知地球的半径R及地球表面的重力加速度g

D.已知卫星绕地球做匀速圆周运动的轨道半径r和周期T

考点:人造地球卫星万有引力定律的其他应用
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填入一个适当的词补全对话,每空一词。

A: Hello! May I speak to Li Ming, please?

B: This is Li Ming    小题1:.

A: Hi, Li Ming, this is Wang Hong. Next Saturday is my mother’s birthday. I want to buy a present for her. Would you like to go shopping with me?

B: Yes, I’d like to. But do you know what kind of things your mother likes?

A: Of    小题2:I know. She likes a woolen sweater.

B: And what color does she like?

A: She    小题3:dark blue to light blue.

B: Then where shall we buy the dark blue sweater?

A:    小题4:go to Yuan Da Shopping Center. There are a lot of beautiful sweaters there.

B: Have you    小题5:to Yuan Da Shopping Center? Is it far from here?

A: Yes. It’s about five kilometers away. We’d    小题6:take a bus.

B: Which bus?

A: The No.8 bus will take us there.

B:  小题7:and where shall we meet?

A: At 10:00 o’clock tomorrow morning at the No.8 bus stop.

B: OK. See you.

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如图所示,一个密闭的容器中充满水,里面有一个用线系住的乒乓球,球的一端固定在容器的底部,容器静止时,线在竖直方向上,当容器向左做匀加速直线运动时,容器中乒乓球相对于容器静止后所在的位置是下图中的哪一个

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下列关于氧氟沙星的理化性质,叙述错误的是()。

A.本品为白色或微黄色结晶性粉末

B.具有有机氟化物的反应

C.左氧氟沙星抗菌活性是氧氟沙星的2倍

D.在稀酸及0.1mol/L氢氧化钠溶液中略溶

E.在光照下稳定

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简述汪古部遗迹遗物

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导致肾性骨病的病因中,不正确的是()

A.缺乏活性维生素D3

B.继发性甲状旁腺功能亢进

C.铁负荷减少

D.营养不良

E.酸中毒

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