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单选题
286、如果污染物造成孔堵塞超过 50%，就要清洁显示组件后面的孔。
A
If as many as 50% of the holes are contaminated, you should clean the display units behinds the holes.
B
The holes on the bottom of the display unit should be cleaned once over 50% of them are clogged due tocontamination.
C
If contamination causes a blockage of more than 50 percent of the holes, then clean the holes on the rearof the display units.
答案解析
正确答案：C
相关知识点：
污染物堵孔超半，清洁显组后孔
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