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单选题
通过按压释放电门释放第一个灭火瓶到1号发动机，第2个灭火瓶通过什么方式释放：After discharge of the first bottle into no 1 Engine making use of the push to discharge switch-light, the second bottle is discharged by means of:
A
30秒后按压同一电门 Pushing the same switch light after 30 seconds
B
60秒后按压同一电门 Pushing the same switch light after 60 seconds
C
在火警保护面板选择OTHR ENG 电门后，按压同一电门 Pushing the same switch light after selecting OTHR ENG switch on the fire protection panel
D
按压另一侧亮着的灭火瓶电门 Pushing the off-side illuminated fire bottle switch light
答案解析
正确答案：D
