25T型(BSP)空调客车内应急灯的额定工作电压为()
A. DC12V
B. AC24V
C. DC48V
DC110V
查看答案
()则用于系统停电自动失灵或液压元件的自控部分故障的情况下。
During the day,a vessel picking up a submarine cable shall carry().
A. three shapes,the highest and lowest shall be red balls,and the middle shall be a white diamond
B. two black balls
C. three shapes; the highest and lowest shall be black balls,and the middle shall be a red diamond
D. three shapes; the highest and lowest shall be black balls and the middle shall be a black diamond
质量管理是以质量为中心,努力开发和提供顾客满意的产品和()。
下列()自动喷水灭火系统,能在火场温度下降后,自动关闭系统。
A. 湿式系统
B. 雨淋系统
C. 重复启闭预作用系统
D. 干式系统