CPU全称是（ ） 。

A:cetral procesing unit B:central processing unit C:central procssing unit D:cetral procssing unit

MCU是（）的缩写。

A:Muti control unit B:Micro Control Unit C:Main Computational Unit D:Memory Control Unit

When securing a flash-type evaporator for an extended period of time, you should _____.

A:fill the unit with saltwater B:fill the unit with de-scaling compound C:completely drain the unit D:tightly seal the unit to exclude air

The unit price is composed of the following parts: measuring unit, unit price figure, money of account, ________, discount and ________.

trade terms, commission.

Just as the tree is the unit of a forest and the book the unit of a library, ______ the molecule is the unit of matter.

A: as B: like C: so D: thus