单项选择题

长期缺乏维生素（），体内粘膜细胞分化受阻，眼睛易出血干眼病
A、Vitamin A
B、Vitamin C
C、Vitamin D
D、Vitamin E

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单项选择题

Which of the following is the main aspect in which public sector bodies differ from charities?

A．Importance of budgeting
B．No requirement to earn a return on assets
C．Funded by government
D．Performance measured by KPIs

单项选择题

（）对1个牵引变电所1次只能下达1个倒闸作业命令，即1个命令完成之前，不得发出另1个命令。
A、供电调度
B、安全员
C、所亭工长
D、供电车间