应急灯光由内部和外部灯光组成，它们为应急客舱撤离提供合适的照明。这些灯光由（）个单独的电瓶供电。
A.2
B.3
C.4
参考答案：C
—Would you please give me _____ bread?
—Sorry, I don't have _____. [ ]
A. some; any
B. any; some
C. some; some
D. any; any
拆除吊篮时应注意哪些事项？
