古代箜篌的方方面面
Aspects of the Ancient Konghou
与父母亲和姻亲关系方面的问题
Problems in relationship with parents and in-laws
与配偶有关方面的问题
Problems in relationship with spouse or partner
奇异线性二次指标最优控制问题LQ问题
singular linear quadratic LQ problem
断面锈蚀
rust of the shear surface
锈蚀面磨光机
oxidized surface-polishing machine
Laplace方程的Cauchy问题
Cauchy problem of Laplace equation
初值问题Cauchy方法
Cauchy’s method for initial valued problem
错误的性质上的方面
qualitative aspects of errors