－ What does the sign over there read － “No person ________ smoke or carry a lighted cigarette, cigar or pipe in this area”

Which do you think is ________, health or wealth？

简易玻璃雾化器的雾化作用是利用_____原理制成；超声雾化作用是利用_____的原理制成。

29．__________ when you are on the bus or bike．

数据模型指的是数据库的组织形式。数据模型的三要素是______。

数据模型指的是数据库的组织形式。数据模型的三要素是 ______。

Which do you think is _________________important, health or wealth?

Either he or I ______to the airport.

Duty is an act or a course of action that people __________you to take by social customs, law or religion.

计算机安全属性中的可靠性是指______。

(单选题)现代色彩中的无彩色系是指____、_____、_____。() (本题2.0分)

现代色彩中的无彩色系是指____、_____、_____。