【单选题】Based on the sectional view of a cylindrical compression spring, t means: (Single option: 10 points)
【多选题】Non-verbal means of communication are ( ) .(more than one option is possible)
【单选题】爱情双方能够 ( ) ,才会让爱情的内容更加丰富、充实。
【简答题】Multiple selection questions (single option) In general magnitude resonant frequency characteristic, wider curve means:
【单选题】Based on the sectional view of a cylindrical compression spring, d means: (Single option: 10 points)