“黑匣子”实际上呈亮橙色，并安装有“声波发生器”，即无线电和声波的信号发射器，以利于事故后的搜寻工作。
Actually painted bright orange, these recorders are equipped with "pingers" or radio and acoustic beacons that aid in their retrieval.
没有延时时间，每个计数器上电后，计数输出是随机的，这样若干LED也许是亮的。
Without the delay time, each counter powers up with a random output count such that several LEDs may be on.
这和开灯类似，不懂电的人，会去试灯泡而不知道去打开开关，所以灯不会亮。
It is like turning on an electric lamp. A person who does not know about electricity will try at the bulb instead of the switch, so the lamp does not light.
应用推荐