— Is it better to be physically attractive or intelligent?

   —                      . 

— Do you prefer a portable or a clumsy 3D printer?

—                      .

Sometimes buyers only purchase some        , tangible or intangible.

You can have eggs      or hard-boiled.

Goods are carried by several        of transport--on road or rail, by sea or air.

      people are no longer worried about whether their food is safe or not      they enjoy a better life.

Every child is unique. Don’t        him or her to others.

— May I suggest the sales start on or about October 1?

—                      .

Prices may change quickly if supply or demand         .

— I wonder whether I could accept this discount or not.

—                      

由能量自动分配及输送子系统和能量自动转换系统所组成的系统称为（    ）。

多选40.化工自动化仪表按其功能不同，分为（    ）。

多选31.在控制流程图中，小圆圈代表某些自动化仪表，圆圈内如果标注为LT21，其意义包括（  ）