填空题 Questions 17-19
Complete the table below.
Choose ONE WORD ONLY from the passage for each answer.
Write your answers in boxes 17-19 on your answer sheet.
Mode of Vibration
Description
　(17)　
moves repeatedly to the left and right
　(17)　
up and down motion; like a wave
torsional
rdsembles motions of a 　(17)