既克服了喷淋系统需要先放走管网内压缩空气的缺点,又避免消防水渗漏危险的自动水灭火系统是( )。
A.干式系统
B.喷雾式系统
C.雨淋式系统
D.预作用系统
参考答案:D
根据句意及汉语提示,写出单词。
1. What can we do under the aging(老化的)_______(人口) situation?
2. 70 _______ (百分之……) of Chinese women are satisfied with their lives.
3. The water level is _______ (上升;增长).
4. We take ten ________ (分钟)-walk exercise everyday.
5. He ________ (吸烟) for years before stopping.