A polyether diol poly[3-bromomethyl-3-tridecafluorooctyloxymethyloxetane]glycol(PFBOX 3) was prepared in 91% yield from ring opening polymerization of 3-bromome
Bamboo viscose fibers and conventional viscose fibers were measured by optical microscopy, scanning electron microscopy (SEM), Fourier transform infrared spectr
Some properties of characteristic polynomials, eigenvalues, and eigenvectors of the Wilkinson matrices W+2n+1 and W-2n+1 are presented. It is proved that the ei
Extended warranty has recently obtained increasing attention from both manufacturers and customers in China. In this paper,given the reality of China, two types