题目内容

As everybody knows, art has no boundary. It involves many factors from different cultures.

查看答案

搜索结果不匹配？点我反馈

更多问题

So learning English can broaden your horizons and contribute to your professional development.

Excellent English will exert a great and long-term influence on art students' career and future.

泡沫产生器固定安装在储罐上，并由泡沫混合液管道与防火堤外接口相连的是（）泡沫灭火系统。

A. 固定式
B. 半固定式
C. 半移动式
D. 移动式

高倍数泡沫灭火系统产生的泡沫，发泡倍数应为

A. 大于20倍
B. 21倍~200倍
C. 大于200倍
D. 大于400倍