题目内容
下列哪个作滴眼液的抑菌剂（ ）
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Motherboard is used to type text or input information to the computer.
Motherboard is the main curcuit board outside the PC. It holds the CPU, and the memory program, to perform the basic arithmetical, logical, and input/output operations.
Monitor is an output device that is used to display the information on the screen.
Generally a mouse has three buttons left and right to perform different functions and a small wheel between the two mouse buttons.
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