可以在一个页面中使用多个〈%@ page %〉指令。
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请解释模拟电话用户话七个功能BORSCHT中各个字母的含义。
You are approaching a vertical lift bridge.You know the span is fully open when（）.
A. Three white lights in a vertical line are lit
B. A red light starts to flash at about 60 times a minute
C. A yellow light is illuminated on the bridge pier
D. There is a range of green lights under the lift spa
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