信息的

The climate of the earth at that time was far different from the icy polar regions and the toastier, tropical middle section we inhabit today.

那时地球的气候和今天我们居住的两极冰冻区域、中央区段是烤面包片的热带大为不同。

It was found that the phase separation behavior of the PANCMA/solvent/nonsolvent systems with and without additive such as PVAL or PVP agrees with the LCP correlation.

研究发现，在水相中马来酸酐极易水解成马来酸，共聚物为丙烯腈/马来酸共聚物，粘均分子量可在10～40×10〓g/mol之间，马来酸的含量为0～15mol％，适合用于分离膜的制备及表面改性。