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[题1]有一光电控制液面高度的仪器,能将光信号转化成电信号进行处理,它是通过光束在液面上的反射光线打到光电屏上来显示液面高度,然后通过装置调节液面高度.如图1所示光路图,当光屏上的光点由S1移到S2时表示液面_______(填“上升”、“下降”或“不变”)[题2]给你下列器材:一个低压电池组、一只小灯泡、一只开关、一只电铃和若干细导线,请设计一个自动放养奶牛的装置图.要求:用细导线将牛群围住,合上开关后,当牛在圈内吃草时,小屋内只有电灯亮而电铃不响;当有牛碰断了圈住的细导线到圈外时,电铃便会响起来,放牛的人能及时发现.
[Item 1] There is an instrument for photoelectrically controlling the liquid level, which can convert an optical signal into an electric signal for processing. It reflects the height of the liquid surface by reflecting the light beam on the liquid surface, and then adjusts the liquid level through the device. Surface height. As shown in Figure 1, the light path diagram, when the light spot on the screen moves from S1 to S2, it means the liquid level _______ (fill “up”, “down” or “invariant”) [question 2] to you The following equipment: a low-voltage battery pack, a small light bulb, a switch, a bell and several thin wires, please design a device for automatic cow raising. Requirement: Enclose the herd with thin wires and close the switch When a cow grazes in a circle, only the electric light in the cabin is lit and the bell does not ring. When a cow touches a thin wire that is trapped outside the circle, the electric bell will ring, and the cattle can be discovered in time.