中国大学MOOC: To help visualize what is meant by a gravitational field we may use lines of force. 下划线部分在句中作 。
举一反三
- 中国大学MOOC: It is our purpose in this section to introduce the basic meaning of the solution of a differential equation. 下划线部分在句中作 。
- 中国大学MOOC: ____ to what we hoped, he offered us no help at all.
- 中国大学MOOC: When asking for help, what principle we should keep in mind? ( )
- On the surface of the moon, the gravitational force(重力) on a body is only 1/6 what it is here on earth.
- 中国大学MOOC: When writing a cause-and-effect essay, what transitional words can we use?