灰平衡的作用是什么？影响印刷灰平衡的因素有哪些？
大多数人认为警察应该竭尽全力维护法律，不会出现任何偏袒。这是什么现象？（） ["角色冲突","规范的身份","角色期望","角色知觉","违反规范"]
What is the main idea of the acquisition-learning hypothesis?
统计上对企业经济成分的推算主要依据是（） ["经济类型","登记注册类型","主管部门或单位","实收资本比例"]
What is the role of environment in language learning according to the behaviorists? And the mentalists?
