题干
— ______?
— It's a Q.
A：What's this
B：What color is it
C：How are you
D：This is what
答案(点此获取答案解析）
A
— ______?
— It's a Q.
A：What's this
B：What color is it
C：How are you
D：This is what
的正方形硬纸，按各边中点垂直折起四个小三角形，做成一个蛋巢，半径为1鸡蛋（视为球体）放入 其 中，则鸡蛋中心（球心）与蛋巢底面的距离为 （ ）
