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单选题
防滞系统预位后，什么时候开始工作？Provided the anti-skid System is armed when does it become operational?
A
一旦出现35节机轮转动信号或机轮承重信号在5秒延迟后显示。Once a 35 knot wheel spin-up signal is present or a WOW signal after a 5 second delay.
B
接地时。 At touchdown.
C
一旦机轮承重信号在15秒延迟后显示。 Once a WOW signal is present after a 15 second delay.
D
一旦出现25节机轮转动信号。Once a 25 knot wheel spin-up signal is present.
答案解析
正确答案：A
