Bob prefers making original pieces rather than reproductions.鲍勃更喜欢创作原创作品，而不是制作复制品。Monochrome reproductions of natural daylight scenes are totally unnatural in appearance.天然光照射下的景物若以黑白方式来重现,看起来总感到不够自然.The walls are covere...
三元络合物中钯与显色剂之比为1:3.The ratio of Pd ( II ) to P - BPF was 1:3 in the Complexes.方法减少10倍取样量,改进层析条件和显色剂.Methods: We improved the condition of chromatography and color - developing agent, and sample quantity was reduced 10 - f...