一种胶体,就其整体而言可认为不带净电荷.A sol considered as a whole cannot have a net charge.照像材料含有亲水胶体的感蓝卤化银卤剂层.The photographic elements contain a blue - sensitive hydrophilic colloid silver halide emulsion layer.胶体的弹性性质可能随着它的寿命而变化的.The e...
Euclid was not always right.欧几里德不一定全对.Where Euclid unconsciously assumed the infinitude of straight lines.欧几里得不自觉地假定了直线的无限性.Some of these are mistakes made by Euclid that can be remedied.有些错误是欧几里德搞错的,可以纠正....