判断题

强大自主、搭配合理的运行网络是中国邮政速递物流能够完成高压工作任务的基础。
正确
错误

答案：正确

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多项选择题

Which of the following factors may work on mechanisms of tumor escape?

A．A. antigenic modulation
B．B. immune inhibitors secreted by tumor cells
C．C. activation of macrophages
D．D. lack of co-stimulatory molecules on the tumor cells
E．E. absence of MHC class II molecule

单项选择题

定义偏摩尔量时规定的条件是（）
A . 等温等压B . 等熵等压C . 等温，溶液浓度不变D . 等温等压，溶液浓度不变