如图所示,铅球A的半径为R,质量为M,另一质量为m的小球B,其球心距铅球球心的距离为d,若的球形空腔,空腔的表面与铅球球面相切,则挖成空腔后A,B之间的万有引力多大?
选择正确的答语,将字母编号写在括号内。
1. Amy: Is it your eraser, Sarah?
Sarah: [ ]
A. Yes, it is.
B. Yes, she is.
2. Sister: Where are the keys?
John: [ ]
A: No, they aren't.
B. Oh, they're in the door.
3. Mom: Where are you, Mike?
Mike: [ ]
A. I'm here, in the kitchen.
B. He is in the kitchen.
4. Tom: This is my home. We have a big living room.
Jack: [ ]
A. It's very nice.
B. Nice to meet you.
藿香正气口服液的功能是()。
A、解表化湿,理气和中
B、祛暑、化湿、健胃
C、情书开窍
D、祛暑除湿,和中健胃