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
（）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（）。
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