【判断题】交换行列式的任意两行(列),行列式值不变。
【单选题】“I don’t think Jack is ready for this position.” “__________________________” “I agree with you, but he can’t do all this work himself.”
A.
But he is such a hard worker.
B.
He should get a raise.
【单选题】I don’t think Jack will come today, _____.
【单选题】以下关于微粒分散系的叙述中,错误的是
A.
微粒分散系有利于提高药物在分散介质中的分散性和稳定性,有助于提高药物的溶解速度及溶解度
B.
微粒分散体系属于动力学不稳定体系,表现为分散系中的微粒易发生聚结
C.
胶体微粒分散体系具有明显的布朗运动、丁泽尔现象、和电泳等性质
D.
在DLVO理论中,势能曲线上的势垒随电解质浓度的增加而降低
【单选题】I don’t think Jack is a man to be ______ when we are in trouble. He only cares for himself.