氰氨化钙是毒性物质,对皮肤有刺激性.Calcium cyanamide is poisonous and irritating to the skin.叠氨化银不溶于水或硝酸.Silver azide does not dissolve in water or in nitric acid.氨化作用、同化作用及滤池的硝化作用是氮的主要转化形式.Ammonification, nitrification and nitrogen assi...
Why aren't all lenses supplied with a lens hood?为什么不给所有的镜头都配上遮光罩呢?The autoexposure button is awkwardly placed under the lens release button.自动曝光按钮安装在镜头脱卸按钮下面,十分不便。Your camcorder should have these basic features: aut...