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If contamination causes a blockage of more than 50 percent of the holes, then clean the holes on the rear of the display units.

A如果超过50%的污染物造成孔堵塞,则要清理显示组件背面的孔。

B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。

C如果50%的孔被污染物堵塞,则要清理显示组件底部的孔。

正确答案:A (备注:此答案有误)

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