...skin wipe, using in fishnets, coffee filters, tents, gunpowder , cotton paper, cotton seed oil and for heat insulator & etc.
...紙,裡面是一層厚厚的草紙,中心部分盛載著一些黑色粉末,稱為黑火藥 (black gunpowder )。各位別輕看這堆黑色粉末,它的威力相當強大呢! 黑火藥是由硫磺 (...
... (1998). A History of Greek Fire and Gunpowder , The Johns Hopkins University Press. ...
Q1. First of all, you need to know that both Cl2 and Br2 are simple diatomic molecules. They have interaction of Van de Waals' force. this interaction is caused by unequeal distribution of electorn. It will make the molecule...