The change of the malonadehyde content in the seed has no remarkable regularity. 照射種子的丙二醛含量變化規律不明顯。
Motion equations of the shell are derived by equation and the variational principle. 利用功率流的基本定義,研究了當殼體受迫振動時輸入結構的功率流和殼體中各內力所攜帶功率流沿軸向方向傳播時的變化規律,旨在為工程中類似結構的減振降噪提供指導性原則。