题型:判断题 The manager, ______his factory’s products were poor in quality, decided to give his workers further training.A.knowingB.knownC.to knowD.being known 查看答案
题型:判断题 下列说法不正确的是A. 分散系中分散质粒子的大小:浊液〉胶体〉溶液B. 利用丁达尔效应可以区别胶体和溶液C. 除去Cu粉中混有的CuO,可将混合物加人稀硫酸中,充分反应后过滤、洗涤D 采用分液的方法分离植物油和汽油 查看答案