单项选择题 “上街”是指（）

未知题型 露点温度就是湿空气达到饱和时的温度。

未知题型 8 LEDs are connected to port 2. They display by the following steps: All the LEDs are turned on for a few second All the LEDs are turned off for a few second The left 4 LEDs are turned on, while the right 4 LEDs are turned off for a few second The right 4 LEDs are turned on, while the left 4 LEDs are turned off for a few second Turn on one by one from left to right