下面是一则说明。
因为地球有X,所以地球表面上的一切物体都能处在位置上，不会悬空。
上面说明中的X指的是什么？
untitled
Quiz
•
Science
•
4th Grade
•
Medium
world edu
Used 1+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
推力
拉力
摩擦力
地心引力
2.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
什么是地心引力？
造成潮汐的力
让植物生长的力
把物体吸向地球的力
让地球环绕太阳运转的力
3.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
地球绕着什么公转？
轴心
月球
星星
太阳
4.
MULTIPLE SELECT QUESTION
15 mins • 1 pt
以下哪一个自然现象的形成与地球的自转有关？
昼夜交替
四季的形成
月相的变化
影子的长短
5.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
白昼与黑夜是如何形成的？
太阳自转
太阳公转
地球自转
地球公转
6.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
地球围绕太阳转动称为什么？
太阳自转
太阳公转
地球自转
地球公转
7.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
A
B
C
D
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