题目内容

The first thing the visitor says to Mr Lessing is...

Are you Mr Lessing?
B. You must be Mr Lessing.
C. Who are you?

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Stella is Mr Lessing's ...

A. friend
B. colleague
C. boss

The three will go to ...

A. a restaurant
B. the canteen
C. Mr Lessing's office

PLC的结构形式可以分为（）和（）两种。

PLC系统的安装方式分为（）、（）以及（）。