What kind of force is the force on the student by the backpack?A gravitational force.A nuclear force.An electromagnetic force.三个选项 选哪个?

What kind of force is the force on the student by the backpack?A gravitational force.A nuclear force.An electromagnetic force.三个选项 选哪个? What kind of questions should I ask? What kind of day is what I want what kind of movie what kind of movies What kind of movies_____Mike_____? what kind of fruit? What kind of fruit? what kind of 用法 what kind of是什么意思 I think sometimes we force ourselve is we lack of knowing what elseto do with persons What kind of person am i in your eyes I know what kind of work do you do What Kind Of Fool Am I (Karaoke) 歌词 ”What kind of drink ( ) you ( ) (like)?I like tea. what kind of club can I join这个语法对吗 What kind of house should i build in earthquake area? If I like you ,you can be what kind of