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问题 单项选择题

在新装置开工过程中，冷油运分馏塔装油一定液位时，可根据以下来判断实际液位（）。

A、液位计

B、塔底压力表

C、塔顶压力表

D、塔底泵入口压力表

答案

参考答案：A

名词解释

花道
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单项选择题

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.

（74）处填（）。

A．erases

B．provides

C．proves

D．values
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