简述无意识教育的两个特点。
参考答案：教育目的的隐蔽，教育方法间接。容易消除领导者与被领导者的地位差别。
磨机轴承设有水冷却装置，其作用是什么？
The relational database model requires the data be (71) through programs that don’t rely on the position of the data in the database. This is in direct (72) to the other database mode, where the program has to follow a series of pointers to the data it seeks. A program (73) a relational database simply asks for the data it seeks; the DBMS performs the necessary searches and (74) the information. The (75) on how the search is done are specific to the DBMS and vary from product to product.
（73）处填（）。
A．consulting
B．containing
C．querying
D．queuing
